Author Topic: a7 not starting  (Read 980 times)

Offline Bsareg

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Re: a7 not starting
« Reply #15 on: 19.02. 2017 00:18 »
My nephew bought some crap brushes from eBay.  When you know a good supplier, why chance It?
C11,B40,B44 Victor,A10,RGS,M21,Rocket3,REBSA

Offline edboy

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Re: a7 not starting
« Reply #16 on: 19.02. 2017 18:47 »
there are quite a few ressurrected items now sold new under the lucas banner. i have no idea if they are linked to the original company and making bits to original spec? or india copies?

Offline beezermacc

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Re: a7 not starting
« Reply #17 on: 19.02. 2017 21:33 »
To answer Edboy's question..........
Wassells sell new pickups complete with brushes. I've had problems with some of the brushes 'powdering' that come c/w the pickups so I always chuck those brushes. The powdering contaminates the slip ring and in the worst cases fills the slip ring housing with dust which prevents the mag working properly, sometimes even after you've cleaned the slip ring. Wassells also used to sell brushes individually, unbranded. I've never had any problem with those, I use them in all my magneto refurbs and never had any problems on any of my magnetos or anybody else's. I've done thousands of miles on my black A10 using a magneto with those brushes and never had to touch it. Wassells now sell brushes in 'Lucas' branded boxes, usually boxes of 5 brushes. These brushes seem identical to the ones previously sold unbranded and, again, I've had no problem with these. BUT they are not the same as the original Lucas brushes which were slightly longer, had lighter springs, and a groove down the side of the carbon brush. There are various brushes sold on Ebay. Researching the market (i.e. buying a few brushes from competitors on Ebay!) I find that some of the brushes are fine - they are the Wassells ones - and some brushes are the ones unscrupulous persons are selling because they know they are cr4p! Some Ebay traders are obviously offloading the brushes they have removed from Wassells pickups! Brushes I have bought from a well known supplier of magneto parts in the UK are also identical to the Wassells ones which are OK. One issue with the Wassells brushes is spring tension. The springs are much stronger than the original Lucas brushes, but they are shorter and I have found, from personal experience, that this doesn't matter provided you are not tempted to stretch the spring too much before fitting. It is worth checking that new brushes are only making light contact with the slip ring; this is quite easy as you can feel the brush hit the slip ring when fitting the pickup - a couple of mm pressure is plenty as the new brushes are very hard, as they should be. If spring pressure is too great you end up with a groove in the soft part of the slip ring which causes the brush to bounce as it hits the brass conductor and the brush wears out due to it bouncing up and down in the pickup. The new slip rings, UK supplied, are much better than the original Lucas ones as the plastic doesn't groove or crack. I have received quite a few magnetos for rebuild where the only problem is 5hitty pickups!
Priory Magnetos Ltd - A10 spares, magneto and dynamo refurbs. www.priorymagnetos.co.uk

Online groily

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Re: a7 not starting
« Reply #18 on: 19.02. 2017 22:22 »
Total agreement with every single word of Beezermacc's post as our experience is identical on every point he makes.
Lots of magnetos are still out there with carbon dust tracking problems and sometimes with sliprings impregnated to the point they need lightly skimming in the lathe to get them properly clean - and with lousy cheap pick-ups as well, which leak when tested hot  - from brand new - for lack of adequate dielectric strength.
Not sure if general resellers of these things are just unaware of the problem, or deliberately unscrupulous (bit of both probably) but the problem has been around quite long enough now for the honest injuns (at least) to withdraw them from sale.
Bill