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Misc: Ignition Idler

timetraveller

Well Known and Active Website User
VOC Member
Haha. That is not an idler. It actually drives the magneto or alternator. It can be replaced with a cam pinion if you have the facilities to machine it to fit. A steel item is heavier than the Tufnol one but I know someone who has used one for years and many thousands of miles with no problem. It would be good to check the bearing before doing the mod.
 
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erik

Well Known and Active Website User
VOC Member
I`m thinking to replace mine because I have a BTH ignition with a Tacho drive and because of that the load is higher and steel would last longer.Regards Erik
 

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timetraveller

Well Known and Active Website User
VOC Member
I would ask what the bearing is inside the BTH unit and if it is strong enough then it would be a good idea. You can always lighten the gear by thinning the flange and drilling holes in it.
 

vibrac

Well Known and Active Website User
VOC Member
I would stick to the softer drive pinion it was retained for the non ATD series D even though I would hazzard the D distributor was a more robust item than a Mag or even a BTH
 

Simon Dinsdale

VOC Machine Registrar
VOC Member
VOC Forum Moderator
A lot of bike manufacturers used tufnol when using an ATD but used a solid metal gear when using a manual timing mag, but not Vincent. I know Velocette used a steel gear on a manual mag so I doubt the weight of a steel gear would be an issue as I would guess its about the same weight as an ATD. Why tufnol for some and metal for others I don't know but it throws the electrical theory out the window.
Simon
 

Vincent Brake

Well Known and Active Website User
VOC Member
I have another bad gear for you, erik. Can that turn it down? Until it doesn't weigh anything anymore.
Greeting

Ich hab dir noch mal ein ungehartes zahnrad, erik.
Kann das mal runterdrehen.
Bis es nix mehr wiegt.

Gruss
 
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Chris Launders

Well Known and Active Website User
VOC Member
I always thought it was in case the magneto seized for some reason it would shed the teeth and not wreck anything, the same applies with the magdyno dynamo drive, strangely they all use steel mag drives, it's only ATDs that have fibre.

You should be able to machine enough away from a cam gear for it to be light enough not to be a problem.

Actually after consideration I wonder if it was so as not to load the mechanism of the ATD centre
 

erik

Well Known and Active Website User
VOC Member
Zündapp ks 600 and 601 have tufnol gears on the camshaft because of the noise.Some cars had it ,too in the good old days.
@ Vincent: Gebongt, mache wir !
 

Pete Appleton

VOC Hon. Social Secretary
VOC Member
VOC Forum Administrator
You don't want to insulate the armature as you need a return path for the HT spark. It is true that the bearings sit in paper insulators but I assume that is to prevent erosion by current passing through them. The earth path is provided by the earth brush.
 

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