Author Topic: pinking gold flash  (Read 2881 times)

Offline derek taylor

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pinking gold flash
« on: 09.06. 2014 19:55 »
engine is pinking when you accelerate under load when it is hot i have put a fuel cat in the tank, its not made any difference it still pinks.
had a look at the points they are clean and at 12 thow plugs are L82C and look rich if anything, bike hase only done 1400 since rebuild? :!

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Re: pinking gold flash
« Reply #1 on: 09.06. 2014 21:18 »
G'day Derek. Is it auto or manual advance? You'll need to back the timing off a degree or two. If you have manual, use it to retard a bit when it pings. If auto you can close the points a thou" or two to test it, if better reset points and re-time it.
1400 miles is just enough time to start building carbon deposits on the piston and comb chamber. This leads to hot spots and pre-ignition.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Offline derek taylor

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Re: pinking gold flash
« Reply #2 on: 10.06. 2014 04:54 »
thanx it's auto advance/retard

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Re: pinking gold flash
« Reply #3 on: 10.06. 2014 10:32 »
I like timing a magie like most here like rockerbox's. If you have it set at 3/8" go back to 5/16".
The only other thing that can help is to richen the mixture, but with sooty plugs already, I wouldn't.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
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Muskys Plunger A7

Online bsa-bill

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Re: pinking gold flash
« Reply #4 on: 10.06. 2014 14:52 »
Hi Dave
Fuel cat - well there are a lot of such things around, not sure I have much faith in them and in any case your engine probably doesn't need lead additive.
However what is does need is Octane, I use Castrol valvemaster plus, it has a lead replacement but more important an Octane booster, this brings your modern fuel back to the levels of bangyness it had in the days your bike was made, £15.00 a 250 mil bottle at Halfords but you only use 1ml per litre so it will last a long time.
Sooty plugs are not always an indication of over rich mixture with today's fuel.
If this is a sudden change of running then Muskrats tips are the way to go I reckon but the Valvemaster will do no harm and might well help
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

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Re: pinking gold flash
« Reply #5 on: 10.06. 2014 14:55 »
Good catch Bill.
 Yes raising the octane from 91 to 95 or 98 will also help.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
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Online Triton Thrasher

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Re: pinking gold flash
« Reply #6 on: 10.06. 2014 16:06 »
Sooty plugs can indicate a rich idle mixture or slide cutaway, while using the wrong notch in the slide needle or a too-small main jet could still make it pink under load.

Offline derek taylor

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Re: pinking gold flash
« Reply #7 on: 10.06. 2014 19:39 »
thanks lads all taken on board

Offline Sparky

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Re: pinking gold flash
« Reply #8 on: 11.06. 2014 14:15 »
Derek,
If the timing/fuel tips above to not correct the problem, a possible cause of racket from the upper cylinder is a bad wrist pin bushing.  I once had one start wearing against the aluminum rod at just a 1000 or so miles after a rebuild.  Unfortunately, removing the cylinders is the only way to make that diagnosis.

Offline derek taylor

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Re: pinking gold flash
« Reply #9 on: 04.08. 2014 19:45 »
right then not done anything about the pinking yet but gunna start on it tomorrow, just been reading the bible and it says tighten the unit   
 on the magneto shaft without the shaft moving. when i take it to bit's and see how it all works it will most probably all fall into place, but if not how do you hold the shaft without it all turning?

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Re: pinking gold flash
« Reply #10 on: 04.08. 2014 21:58 »
Press the drive gear hard onto the magneto shaft with your thumbs, before tightening the nuts. The taper should grip it.

Doesn't always work, so check the timing afterwards..

Online Brian

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Re: pinking gold flash
« Reply #11 on: 05.08. 2014 03:29 »
Dont forget to wedge the auto advance unit in the fully advanced position when you set the timing.

Offline derek taylor

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Re: pinking gold flash
« Reply #12 on: 05.08. 2014 06:26 »
thanx lads

Online Ted_Flash

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Re: pinking gold flash
« Reply #13 on: 05.08. 2014 08:21 »
I always remove the earth screw on the magneto and put a bolt in to nip the armature and hold it where I've set it, before fitting the pinion.  I think the bolt is 5/16 cycle thead
Ted Wilkinson, Ramsbottom, Lancashire
1950 Golden Flash

Offline derek taylor

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Re: pinking gold flash
« Reply #14 on: 05.08. 2014 19:55 »
ok checked the timing, the points just part as near as dam it 5/16 btdc.
i don't think that is to far advanced?