The BSA A7-A10 Forum

Technical => Lucas, Electrical, Ignition => Topic started by: BSA Biker on 16.06. 2018 15:59

Title: Help Please, with my Magneto
Post by: BSA Biker on 16.06. 2018 15:59
Hi all, last year my Lucas K2F magneto was playing up so it was sent to Dranganfly to be rebuilt. Turns out they use a sub-contratctor to rebuild them so more expense incurred using a middleman.
At the same time I reduced the piston comp to 7.25:1  from 8:1 for my A7SS as my R/H knee is not able to be used for kicking over the engine anymore and it seems strange using my left leg.
So on rebuilding the engine it just started and then stopped after running (roughly) for a few minutes. Thinking that the tappets had closed up, they were readjusted and the timing re done. It then would not start again even after many (40plus) attempts to reset the timing. Now after going down to 6.6:1 comp pistons it fires up but only on one cylinder, first RH then another time LH. But at the sparking plugs when checked on top of the cylinder, both plugs in their HT leads spark correctly. The carb. was renewed some time ago as the old one was slightly distorted (bought at a auto jumble secondhand). Today changed back to the old one without any change.

Any suggestions, please don't say that the HT leads are the wrong way as that was checked a long time ago. Both at the mag and the cylinder.
Failing that, does anyone know of another person (who is an expert) to repair another magneto which was bought off Ebay not working properly.
Title: Re: Help Please, with my Magneto
Post by: RoyC on 16.06. 2018 16:35
Could be duff spark plug/s that spark out of the engine but not under compression.
Title: Re: Help Please, with my Magneto
Post by: Bsareg on 16.06. 2018 18:37
Try drawing on a piece of paper with a pickup brush. If it leaves somthing like a pencil mark, it's too soft and could leave a ring of carbon on the slip ring. Plugs will fire but may not fire corectly when under compression. There's a lot of crap ones out there. I've had no problems with the Brightsparks ones.
Title: Re: Help Please, with my Magneto
Post by: morris on 16.06. 2018 20:01
Sounds like your mag has been badly restored. Send it to Brightspark for a proper job.  Highly recommended. And he’s based in Normandy France so from Spain won’t cost you to much on sending costs.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 20.06. 2018 15:35
Well thank you all,

Today after giving the slip ring a good clean, changing the very soft carbon pick-up brushes, and giving it another quick ignition re-time, it finally fired up and sounded like the old bike thats been loved (and cursed) for the last fifty plus years.

When the temperatures go down later tonight it will be given a trial run before cleaning, checking over and then the ITV test, (Spanish MOT).

It will be good to use it again after almost a year of problems, didn't even give the carbon brushes a thought, Chinese again?.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 21.06. 2018 16:00
Well, when the temperature dropped to about 80*F last night I took it for a ride, great progress until the magneto got hot from the engine (about 3 miles) then it started the odd misfiring again. This happened with the mag before it was rebuilt and to another that was bought on eBay as a "good one". Whats the chances of that happening to three mags? the soft carbon brushes were fitted all the time so am going to give the slip ring yet another clean tomorrow and then se what happens.

The carburettor is a new remake of the Amal monobloc (made in Salisbury) with all the correct jets etc so not thinking its that, any suggestion if the slip ring is clean.
Title: Re: Help Please, with my Magneto
Post by: stanwhite on 21.06. 2018 19:42
Any chance it could be a valve sticking when hot?

A useful diagnostic if it is ignition:  Reduce the plug gaps. A lot!!! Run gently. If all is OK, this could indicate an insulation breakdown somewhere. The higher the cylinder pressure (high comp pistons, large throttle) the more volts you need to spark, and if there is a "better" gap someplace else, it sparks there, and not at the plug. Temporary very small gaps may help prove the point. The engine won't run right, so be gentle, and not for too long...

Whatever it is had transferred across all three mags. I assume you didn't change the plug leads, caps, and plugs?

I got caught out a year back with a VW car. It had leads that needed the small cap screwed on the end of the spark plug. These were not fitted, resulting in an extra gap in the HT circuit, higher than normal HT voltage, (a lot higher, 45kV!) and arcing all over the place. Funny thing, it had been like this for some years before it gave trouble. New leads and plugs, happy car...

Are your plugs too "cold", and oiling up shortly after setting out. (Pull one out at the roadside and check, and if it is "black and oily" that is not good...).

HTH,

 Stan.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 21.06. 2018 19:58
Hi Stan,

When I cleaned up the slip ring etc the new HT leads and pick ups with hard carbon brushes were changed over from the other set with the soft brushes which had been there for some time.

Normally the plugs are  B8ES but the other day I changed them to B7ES to see if it made any difference, but all of them are black and oiled up a bit, not helped by me changing the pistons to 6.6 :1 compression from7.25 : 1 after not being able to kick them over anymore. Carb has been jetted for them though.
Title: Re: Help Please, with my Magneto
Post by: stanwhite on 21.06. 2018 23:55
Sounds like you have two choices...  Even hotter plugs, or ride harder...

If you have a spare set, ride until it starts to misfire, then change the plugs. If then OK for a few miles, a hotter plug is probably called for and black and oily does indicate insufficient plug temperature.

Higher cylinder pressures mean higher temperatures. You reduced the compression, lowering temperatures, so that suggests a hotter plug is needed to burn off the contaminants.

HTH,

 Stan.
Title: Re: Help Please, with my Magneto
Post by: duTch on 22.06. 2018 01:20
 B-B, I've been running B6ES with 7.25:1 (Ally head/Flat-Top) pistons, and it seems to be ok after a fewK miles (air temp range 10˚C- 42˚C), maybe try it
Title: Re: Help Please, with my Magneto
Post by: wortluck on 23.06. 2018 21:33
B6HS for me, work well but can be a tad sooty at times - not oily though.  Found riding it hard was fun and changed the plugs to a nice tan colour *smile* *smile*  I reckon you've checked the points gap hasn't closed up - this resulted in lousy running for me.  Other than that it's going through everything bit by bit - pain in the a**e *problem* *bash*
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 13.07. 2018 10:20
Thanks to all your help the old gal is finally going like it should. Tuesday last it passed the Spanish ITV test (MOT) they even did the noise test which worried me no end, but the chap very slowly gave it a little bit of throttle and then stopped, hey presto it passed. After all the other parts were completed and it was time to go, I forgot myself and gave it a handful to pull away, it rather loud then, but the test was over and the money paid etc I was gone before he could say anything. 21.21 Euros, not too bad for two years, but it would be unnecessary in the UK and France.

Returning to my magneto problems, it was very soft carbon pickups that caused the problems. There was so much deposited on the slipping that it must have been arching all over the place. Lots of meths and clean rag and eventually okay. But why do the suppliers allow this rubbish to be imported from China or Taiwan, must be very cheap to them I suppose.

My spare magneto will be used when it eventually comes back from Brightsparks, thanks Bill.  But at least the bike now starts first kick every time, just like in the old days. Only trouble now is that its too hot to use it for very long periods.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 13.07. 2018 11:42
it was very soft carbon pickups that caused the problems. There was so much deposited on the slipping that it must have been arching all over the place.

Glad to hear that with the help on here you've sorted it.

Here's a warning to others when replacing magneto pick ups and brushes *problem*

Coincidentally, earlier this week I thought I'd treat my 1960 GF to a new set of magneto pick ups, ht leads and plug caps. I bought Lucas pick ups and tested the brushes before fitting and was disappointed to find them very soft. Attached is a photo showing the difference in the new Lucas ones and my old ones (blue arrow) when I tested them on the inside of the Lucas box lid. Needless to say I changed the brushes over for my (luckily) very little worn old brushes. Unfortunately I can't remember where I bought the original good brushes.

Also there is no groove on the Lucas brushes for the spring to locate in - hence the carbon brush easily drops out of the spring when fitting (absolute rubbish)  *pull hair out*.

Photo attached of brushes and the box label.
Title: Re: Help Please, with my Magneto
Post by: a101960 on 13.07. 2018 15:35
Quote
I bought Lucas pick ups and tested the brushes before fitting and was disappointed to find them very soft. Also there is no groove on the Lucas brushes for the spring to locate in - hence the carbon brush easily drops out of the spring when fitting (absolute rubbish)
How appalling. I trust you have sent a snotogram to Lucas. I shall be interested to see their response.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 13.07. 2018 16:06
 As usual someone is trading on a once good company name having bought just that, the company name. Then goes on to buy cheap rubbish from China or Taiwan and charge over the top prices for it, making out that it is the genuine British stuff. We have all been caught out like this.

What is going to happen when the chap working from an industrial unit gives up and finally retires. Will this be the end of using old motorcycles, or will we be too old ourselves to care?.
Title: Re: Help Please, with my Magneto
Post by: a101960 on 13.07. 2018 16:38
Quote
As usual someone is trading on a once good company name having bought just that, the company name. Then goes on to buy cheap rubbish from China or Taiwan and charge over the top prices for it, making out that it is the genuine British stuff. We have all been caught out like this.
In this case Lucas = Wassel, so we do know who to complain to. If you do not complain you get what you deserve and you are by default encouraging the bas***ds. Apathy and inertia is what enables them to do business this way. Good brushes are readily available from competent magneto repair specialist. If I get bad stuff I complain and so should everyone else affected in this way. After all it is a legal requirement under the sales of goods act that goods purchased must be fit for purpose and of merchantable quality. Always remember the law is on your side.
Title: Re: Help Please, with my Magneto
Post by: stanwhite on 13.07. 2018 17:05
You could always make your own, from 9H pencil leads...  They are very hard, so much so that they are difficult to write with, and rarely need sharpening  *sarcastic*
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 13.07. 2018 17:56
quote author=stanwhite link=topic=13086.msg105627#msg105627 date=1531497906]
You could always make your own, from 9H pencil leads...  They are very hard, so much so that they are difficult to write with, and rarely need sharpening  *sarcastic*
[/quote]

Very small diameter though, the normal pencil size.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 13.07. 2018 19:25
If I get bad stuff I complain and so should everyone else affected in this way.

Quite agree and I intended to bring it to both the seller's and the supplier's attention - not that I think it'll worry them too much or even make a difference.
To be fair, in this case, the pick ups themselves were fine, it was only the carbon brushes that seem to be sub standard.
Highlighting it though, as I have done here and bringing it to fellow enthusiasts attention may be effective in more ways than one. I don't mean affecting sales of sub standard parts, as a miniscule dent in sales probably wouldn't even be noticed, but if it encourages us to buy from suppliers who we know strive to supply us with high quality items it may encourage them to keep going and continue to supply parts for our classic motorcycles and also it may help to prevent a few headaches amongst us.
Title: Re: Help Please, with my Magneto
Post by: bsa-bill on 13.07. 2018 20:58
do we need a BSA Ombudsman   *smile*

I was chased for someone elses's debt over a period of four years, solely on the basis of my surname being the same. Financial Ombudsman sorted it out and I got £350 quid compo - yeah it pays to complain
Title: Re: Help Please, with my Magneto
Post by: coater87 on 14.07. 2018 00:21
 A place called Helwig Carbon can supply absolutely any brush you could need.

 Lee
Title: Re: Help Please, with my Magneto
Post by: duTch on 14.07. 2018 00:38

 
Quote
...Thanks to all your help the old gal is finally going like it should. .......

 If I recall correctly, it's an El Plungo, hey?   Either way, great it's finally happening *wink2*, and Happy Trekkin'....you'll enjoy it and forget about the hotness  *smile*
Title: Re: Help Please, with my Magneto
Post by: groily on 14.07. 2018 08:17
The lousy quality of some of the HT brushes out there has been long remarked on and long moaned about, and yet the parts keep coming  . . . traders sell them without really knowing there are problems, and the end-user is so remote from the maker that the usual channels don't seem to have fixed the problem. Soft brushes WILL mess up the slipring and cause trouble, and they've been doing it for ages. The way things look, they'll continue to do it too.
That said, most of the ones to be found in the little green 'Lucas' boxe are, now, OK as far as I have seen. They don't write like an HB pencil. BUT the ones supplied ready fitted to many pick-ups are useless.

Additional factoid: a lot of pattern HT pick-ups are lousy too.
I used a brand new pair (with good brushes) supplied by a customer on a bog-standard K2F this past week (with trepidation, to see if the cost of 'better' could be avoided)  . . .  At test temperature (50°C) the magneto required well over 200rpm on the armature to fire the prescribed Lucas test gaps and got progressively worse with more heat applied. With better quality pick-ups, same temperature etc, that came down to 135pm. Which is more like. Hot starting is always going to be a pain if you need to get the engine up to 400rpm+ on the kickstart . . . Lucas said we should see 90% of sparks across 5.5mm test gaps at 130rpm cold, advanced, and it's a good basic specification - equating to reliable continual sparks at 260rpm on the kickstart.

This is a particularly relevant issue for A 7s and 10s because with a manual mag, if an angled HT pick-up is required on the front cylinder, the only commonly-available 'new' part that fits easily is the angled and cranked article supplied to the trade by Wassell and maybe others. A simple vertical one will usually fit, but be tight to drip tray or AR cable or whatever, but a plain angled one won't go on. Ergo, people buy the cranked item of poor quality. Usually supplied with a soft brush, and troubles start.
Where possible, I'd fit a vertical one of good provenance to the engine side.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 14.07. 2018 14:34
That about sums it up Bill.  *sad2*

After recommissioning my A7SS from a 10 year lay off three years ago, I replaced the pick ups with the angled ones bought from Ray Fisher in Christchurch. He is a genuine dealer who I've known since before I was legally old enough to ride bikes on the road. In those days he was the Triumph and later BSA agent for our area, after Reg Marsh retired. Indeed I even bought the bike from him for £89.00 in 1967, he still says he would "take a chance" and buy it back for the same money, surprisingly I've refused that offer. Because he is genuine, I would not dream of complaining to him as it is not his fault, the wholesalers should by now know about this problem but as usual don't care. Just keep selling poor or substandard products to our ageing community.

P.S. Took the Bonneville down to the coast this morning in 100*F temps, must be mad, 200 kms and absolutely Kn--- kered, - all in. Too hot for the A7SS and me . Didn't look at the young girls on the beach though.   *smile*
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 14.07. 2018 16:45
If anyone is interested, here's what I've sent to Wassell and the seller.

As BSA Biker (reply 23), I don't blame the seller but felt they should know about it. I don't expect replies, but if I do I'll post here.

The pick ups I fitted are the angled left & right ones (see pic. of 458866).  I did check that the contacts inside didn't have any plastic flashing on them, they were both clean inside and the moulding was good and the screw in the HT end was substantial and firm.

Bill (groily) An interesting assessment of yours. Are these the pick ups (see pic) the ones you refer to?
If you use good brushes in them why would the pick ups cause problems when hot?

(Edit): I typed addresses instead of addressed  *doh* but I think they'll get the meaning.
Title: Re: Help Please, with my Magneto
Post by: groily on 14.07. 2018 17:30
And your tale sums it up too. Not Ray Fisher's fault, certainly, and if he knew the scale of the problem I bet he'd stop selling the crap.

And yes, editing here (1st go), they look like the bits Roger. But the part no. moulded in is new to me, so can't be 100% sure. However, if the brushes in the thing are the sort that have typically been supplied with the unnamed bits, they're trouble. The ones in the green boxes are often better than the ones that come with the pick-ups, from what I have seen, but who knows whether now we all get the same, whichever way we buy the parts  . . .

Edit again (2nd go)- why problems with the pick-ups? Dielectric strength inadequate. Ie not a strong enough insulating material. Might not feel a shock straight through the thing - though that happens too - but there are leaks to earth on a lot of them, at HT voltages, which is why the test performance is worse than either a good Lucas original if one can be found, or a good part made in the UK or elsewhere. Most repairers in the UK use products moulded by a v good UK maker; in continental Europe there are other options, including excellent Swiss-made parts. But both cost more than the traditional half-a-crown or 35c or whatever which is the equivalent of the cheapo articles widely found on ebay  . . .. The test is 'do they leak, hot or cold, at seriously high voltage?'. The answer is, some do. I've seen them make sparks that can jump from pick-up retaining screw/clip to the rear of a cylinder barrel - from brand new  . . . and small level shocks are common if you put a wet finger on one and across to the mag body. Don't if you have a pacemaker!

Another thing while you're on - the thread for the acorn nut in the pick-ups that offend (and this might be one, as I say)  is 13mm. A correct 'nut' is 1/2 BSF. A 1/2 BSF correct bit won't screw into the replica p/up. Can't tell you how many 13mm nuts are littering my shed  . . . nor how bloody irritating it is.
I'll get some of those pick-ups and test them hot on a mag I think  . . . facts are useful sometimes in these discussions!

An aside, off topic, but I went to Ray's place with some French friends several years ago (boozy camping trip sort of thing)  . . . We had busted the gear selector return spring on a 1942 ex-Italian army 500 Guzzi single somewhere in the New Forest after eating dead animals at the Red Shoot Inn, and we weren't going to get to Poole for one of the evening gatherings if we couldn't sort something out and get the bike running again. Ray was that good - he had a big box of god-knows-what springs and assorted unmarked gearbox bits, and he just said 'Go rummage' . We did - and by one of those minor miracles, there was a spring that did the job. For which he wouldn't even take any money. Good bloke or what?!



Title: Re: Help Please, with my Magneto
Post by: RogerSB on 14.07. 2018 18:42
Thank you Bill, for that detailed explanation. I'll try to think of a way to test the pick ups - without giving myself a nasty shock  *eek*.

(Edit): Just returned from an hours non stop ride tonight with Shirley on pillion and GF didn't miss a beat, started first kick, so the Lucas pick ups seem to be ok so far  *smile*.
Title: Re: Help Please, with my Magneto
Post by: JulianS on 14.07. 2018 20:02
Just got a nice pair of quality clip on pickups with brass internals, BSF acorns, paper gaskets and good quality brushes from  C and D Autos £27.90 plus postage.

The ones which have the metric acorns usually come with red fibre gaskets.

The metric acorns dont fit either Real Lucas or quality repro as above. 

Brushes? Boxes of new old stock Real Lucas often found on e bay. One box will last many years.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 14.07. 2018 20:07
The ones which have the metric acorns usually come with red fibre gaskets.

 *eek* Like mine  *eek*.

I see Brightsparks also sell them with brass internals. I was going to buy them but wanted the gaskets also and they don't come with their pick ups and they don't sell them - so opted for the Lucas ones - which I hoped would be ok. 
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 14.07. 2018 20:36
I am surprised that Brightsparks don't sell the paper gaskets they sell the other parts so the gaskets are the minor problem, and you are getting a quality item with the pickups.

Bill, as you know Ray is the most genuine dealer you could meet. Did you enjoy the Red Shoot meal, by the way, took the wife there years ago for one and it was good then. Really miss the New Forest, but not the tourists in the summer.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 14.07. 2018 22:34
I am surprised that Brightsparks don't sell the paper gaskets they sell the other parts so the gaskets are the minor problem, and you are getting a quality item with the pickups.

I did email them to ask and I was surprised that they didn't sell the gaskets.
I agree gaskets are minor and opting for the Lucas pick ups, it seems in retrospect, was not the best of decisions, but I suppose easy enough to correct if needed. My run tonight didn't highlight any problems with the Lucas pick ups but I did have the sense to substitute the terrible carbon brushes for decent ones beforehand.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 14.07. 2018 22:53
  Roger,  Trouble is we all think of the old Joseph Lucas and trust that the modern stuff will be up to that standard, unfortunately it is not the case as usual.
One day people will wake unto the fact that stuff made in the far east is quite often rubbish, and businesses in the UK just want to make a quick shilling at our expense.

Don't know who in modern times called Joe "The Prince of Darkness",  in their day they were as good as any other lights, how I went at 80+mph in the dark then I will never know now. Just young and stupid I suppose.

I intend to find my old original pick ups and see if they will clean up to use again. Wish that I'd done that in the first place. Hope they are not in my UK garage, problems, always something.
Title: Re: Help Please, with my Magneto
Post by: groily on 15.07. 2018 07:51
Red Shoot was good, yup. One of the sorts of things we miss in France and Spain - but there are other compensations I reckon.
(Brightspark didn't do gaskets because we couldn't be sure of a decent regular supply for all the different ones; but we probably should have tried harder . . . oh well!)
Cheers, Bill
Title: Re: Help Please, with my Magneto
Post by: JulianS on 15.07. 2018 10:31
This is what I got for my £27.90 plus £4.10 post.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 19.07. 2018 16:46
Update: I couldn't stand the thought of having magneto pick ups that may cause problems so invested in the ones from Brightspark Magnetos and fitted them this afternoon.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 19.07. 2018 20:14
Great idea RogerSB,   still waiting for my "spare" magneto to be returned from Brightsparks, not their fault really lost in the French postal service, with the holiday season coming up, it could be a problem.

At least the other one is going okay now that the slipring is clean.

On a completely different note, has anyone seen the advert for the "new" Wassell copy of the Amal concentric carburettor, loads cheaper than the new Amal company's model so will that be an end of them because they are unable to compete on price?. Beware of forgeries comes to mind.
Title: Re: Help Please, with my Magneto
Post by: JulianS on 19.07. 2018 20:58
i would rather not have a carb with wassell on it.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 19.07. 2018 21:10
And now I've learned my lesson with anything Lucas on it *sad2*.

Just returned from an hours ride on Dartmoor tonight to test my GF with the Brightspark's pick ups, lovely evening - and was not too hot in our Motor cycle gear. Photo was taken in a WW2 dispersal bay at RAF Harrowbeer WW2 airdrome.
Title: Re: Help Please, with my Magneto
Post by: BSA Biker on 19.07. 2018 21:15
  JulianS   I agree whole heartedly. 

As usual made in China no doubt down to a budget, but unfortunately they will most likely be sold on Ebay later even cheaper.

Then the chap who owns the Amal name will not be able to compete.

  RogerSB,  Glad that you enjoyed your evening trip on Dartmoor, oh to be in England now that summer's here.
Title: Re: Help Please, with my Magneto
Post by: morris on 20.07. 2018 22:26
On a completely different note, has anyone seen the advert for the "new" Wassell copy of the Amal concentric carburettor, loads cheaper than the new Amal company's model so will that be an end of them because they are unable to compete on price?. Beware of forgeries comes to mind.
Things like that make me think of the €1 (or £ or $) t-shirt. Easy to forget that the poor man/woman who made it earns about a dollar a day if they’re lucky...
Just have a look at a carb and try to figure out how many hours it would need to make all the parts, cast and finish the body and assemble it. Then draw your conclusion...
Title: Re: Help Please, with my Magneto
Post by: lawnmowerman on 21.07. 2018 13:22
And now I've learned my lesson with anything Lucas on it *sad2*.

Just returned from an hours ride on Dartmoor tonight to test my GF with the Brightspark's pick ups, lovely evening and was not too hot in our Motor cycle gear. Photo was taken in a WW2 dispersal bay at RAF Harrowbeer WW2 airdrome.

Hi Roger

Based on your recommendation I have just ordered a pair of Brightsparks pick ups, brushes and acorns. My Super Rocket has been suffering from the dreaded "firing on one" syndrome and I pulled the brushes and they failed the "drawing on paper" test.
The pickups were the six sided universal cranked type so I do not trust them either. Probably made in China via ebay.
Cleaned up the slipring as best I could with switch cleaner on a rag through the pick up hole while slowly turning the engine - plenty of carbon came off on the rag. Felt a tingle through my finger so the mag must be working  *smile*.
Just waiting for the bits to arrive next week and hopefully my problems will be solved.

Jim
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 21.07. 2018 17:50
Hi Jim, I hope the new pick ups will sort your problem out, there's nothing more annoying than something being wrong but difficult to pinpoint.

I made and used my own pick up gaskets in the end from some spare 0.8 mm thick Flexoid gasket paper. I used the Brightspark's brushes and springs even though the brushes marked the paper more than my old ones that I used last week to replace the Lucas ones.

Don't be too alarmed if the brushes from Brightsparks mark paper more than you may expect. As far as I understand it the outer surface is likely to have a covering of soft dust particles from the manufacturing process, which soon gets rubbed off. I'm trusting Brightspark's stuff to be 100% right for the job in hand  *countdown* .

From what I have learned, the material carbon brushes are made from is critical for reliability and performance for the particular job they need to do and the same goes for springs. Everything must work together in perfect harmony. Brushes must not be too soft or too hard and the springs must be the correct length and strength for the brushes. We know the problem we get with brushes that are made of the wrong material but the same goes for the springs. If they are too strong, or too long or even if the brushes are too hard then there's the added danger of the slip ring's insulating plastic being scored over time. In a twin it's the plastic insulator that wears easier than the brass segment and then the brushes will have a little jump everytime from worn insulator to brass segment. Singles, having a continuous brass ring around the slip ring, do not have this problem.

My test after checking the continuity from center elctrode on spark plugs to carbon brushes with a multi meter and then fitting was a non stop 50 mph ride over Dartmoor (for 30 mins). A 30 min stop (engine was cut). A restart (fired first kick *smiley4* ) and the ride back over Dartmoor to return home. After a few minutes of arriving home and cutting the engine I started it again as a further restart test - and all seems well *smile*.



Title: Re: Help Please, with my Magneto
Post by: lawnmowerman on 26.07. 2018 18:04
The Brightsparks parts arrived today and I have fitted them. The bike started first kick and was probably the best tickover I have ever had.

The old pick ups were the universal six sided cranked type with metric acorns which have now gone in the bin.

I used the red fibre gaskets from the old pick ups.

For reference for others with the same problem, the parts I ordered from Brightsparks were:
Pick-up LPU 458367
Pick-up LPU 458866
2 x LAN Lucas acorn nut (the old metric type do not fit)
2 x Brush 5 (5mm brush)

Cranked pick ups are not required - I used a 90 degree pick up in the top which just fits alongside the advance retard housing and a 45 degree in the bottom.

Thanks to all who contributed to this topic and also to Brightsparks for selling quality parts which actually work, unlike most of the cheap ebay stuff which is a waste of money.

Jim
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 26.07. 2018 20:57
That's excellent news to hear.
My wife and I went for a 21 mile circular ride on the narrow twist roads of Dartmoor again tonight. GF performed faultlessly again, so all good and a pleasant ride except for some very poor road surfaces.
Title: Re: Help Please, with my Magneto
Post by: RogerSB on 27.07. 2018 10:09
Hi all, just a quick update on my messages to Wassell and the seller of the Lucas pick ups (reply no 24). Two weeks on and, as expected, no replies received from either, so draw your own conclusions as to how they think about us.
Title: Re: Help Please, with my Magneto
Post by: lawnmowerman on 27.07. 2018 11:23
Hi all, just a quick update on my messages to Wassell and the seller of the Lucas pick ups (reply no 24). Two weeks on and, as expected, no replies received from either, so draw your own conclusions as to how they think about us.

When and if you do get a reply it will probably be along the lines of "Well we have sold thousands and nobody else has complained"  *smile*

Jim
Title: Re: Help Please, with my Magneto
Post by: coater87 on 27.07. 2018 12:07
Hi all, just a quick update on my messages to Wassell and the seller of the Lucas pick ups (reply no 24). Two weeks on and, as expected, no replies received from either, so draw your own conclusions as to how they think about us.

When and if you do get a reply it will probably be along the lines of "Well we have sold thousands and noboby else has complained"  *smile*

Jim

 That is when you know they have had many complaints and plan to do zero about it anyway.