E: Engine magneto bearings

[Bill Thomas]

I assume Trevor is referring to this high plastic which will withstand high temperatures:
https://en.m.wikipedia.org/wiki/Polyether_ether_ketone

That's a good read, I wonder if that's what they put in my Head ?. Cheers Bill.

 

[Magnetoman]

Look up the thread "Magneto woes" April/May 2013

I'd forgotten about that. I was happy to see in that old thread that my answer then was the same as it is now so, whether or not my answer is a good one, at least I'm consistent...

 

[tatty500]

Eric
If your mag has the smaller drive end bearing (15x35x8) then you are lucky perhaps, as there is a larger OD bearing 15x37x8, N3048. But I can't see one to replace the bigger 18x40x9 that was a later fitment.
Tatty

 

[nkt267]

Tatty500.. that's what I did..I made a carrier to mount the mag on and bored the bearing housing to suit the larger bearing..John

 

[greg brillus]

Of course being a common K1-F you could just find another serviceable housing.

 

[erik]

unluckieliy there is the bigger bearing.but i think that my fried,he has a whole machine park can mill the housing and fit in a spacer.may be Aluminium alloy is best because the housing is the same.i have a twin housing which could be converted to a single mag.may be this is an other way to go.

 

[chankly bore]

If it is a KVF housing don't alter it. They are getting hard to find.If it is a Triumph/BSA OR Norton you may have to remove one safety gap screw, and drill new holes for the pick-up bolt threads, I'm not sure. I am no great machinist, but I reckon you'll do a better job in brass. I'm fairly sure you can get the paper cups in two thicknesses if you want to sneak up carefully on the finished diameter of your insert.

 

[erik]

it is a Triumph magneto.there is no Need to alter the Position of the pick up ,because the contakt ring is all round and it doesn`t matter in which sosition the pick up sits.you Need the single cam and the single high Tension ring.thats all.

 

[erik]

does anybody know how big the bore should be for the inner bearing and the paperwasher?

 

[chankly bore]

Paper washers are available in .010" and .013" thicknesses. I would make your holder a press fit on whatever o.d. your bearing plus the paper washers are and the a light interference fit, say dead size with Loctite or 0005" at most into the magneto body. I reckon you'll do a better job with brass.Remember that heating the magneto body will impair the magnetism. What do the real engineers out there think?