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Allan G, GrandPaul, JER.Hill, johnu, NickL
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Original Post (Thread Starter)
#846199 04/15/2021 6:12 PM
by DMadigan
I posted a picture of this clutch on the Triumph board but when fitting it I found that I actually made it for the A65. The Triumph version needs the damper retaining plate moved outboard to clear the sprocket door.
[Linked Image from]
[Linked Image from]
Liked Replies
#857877 Sep 8th a 02:42 AM
by DMadigan
`Why - you get an 8/9 plate clutch, readily available plates, standard or 20% stronger Belleville spring, chainwheel that does not flop around when the pressure plate is lifted.
2 members like this
#846382 Apr 17th a 05:42 PM
by DMadigan
Uses stock fat washer and shouldered nut.
[Linked Image from]
1 member likes this
#847163 Apr 26th a 05:43 AM
by DMadigan
After talks with Allen, I changed from the stock range of ratios to a wider gearset with 1st at 2.786. I came up with two options for in between. One has a more straight line in the MPH/shift curve, the other drops off more. A disadvantage of the ratios that drop off more is it needs a different cutter for one gearset. The more linear gearset can be cut with one Module cutter set.
I found the Norton also uses a circlip to butt up the clutch hub against.
I think the needle bearing in the door would be the best option. The root of the output sprocket spline is 34.29mm. The high gear seal is 1.1875" (30.16mm) so nothing else fits without grinding the inner race.
BSA racing colours were red/white so red would be an option. When I had the rebuildable sliders hard anodized clear they came out sort of olive drab. That would be an interesting choice.
1 member likes this
#847413 Apr 28th a 09:23 PM
by DMadigan
Basket, drum and hub
[Linked Image from]
I will widen the base of the tab tangs and notch the outer edge. If this were made from steel like for the B50 then just notch the edge.
The roll pins, dampers and plates are KTM 450. Add on top the KTM pressure plate and diaphragm spring. Barnet sells a 20% stronger spring.
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