Forum

[Adrian]

Unfortunate name for the replacement alternator, given the context of this thread! A.

[Norm]

I have seen exactly the same about 12 months ago on an Inter, for no apparent reason it did that

[Norm]

Simon, sorry to say but the clutch still slips, guess I will have to live with it, better than it dragging

[Tim NZ]

Norm

You need to have close look at the lining material on both surfaces of the chain-wheel, and double double check that NONE of the plates are at all warped.

I fit std Indian Bullet plates and springs in all Clutches including the Inter and the Scissor clutch. Many of the 'clutch problems' that people encounter are related warped plates, and or glazed chainwheel linings, followed by misaligned primary chain, too much oil and wrong oil.

[Norm]

Tim I have tried all sorts of combinations I can think of, many sets of plates, new steels, clutch hub was new, I'm not going to worry about it anymore I'll just live with a bit of slip, it is no big deal. If I increase spring tension, I get drag and notchy gearchanges so bit of slip is best

[papasmurf]

Throwing in my two pennyworth and probably teaching to the converted. A big improvement in how multi-plate clutches operate. Even brand spanking new ones is to de-burr the slots the plates move in an out in, and make sure the slot faces are really smooth with no grooves in them. Also de-burr the "tangs" on the clutch plates that slide in the slots.
I found over the years, a set of rat-tail files is your friend, in many cases, where something sticks, flexes, or bends.
It usually mean something is catching somewhere.

[simon]

Just to poke a small stick in your hornets nest Norm but looking at the parts list for the early Interceptor it does seem a ridiculously small clutch for a 750cc bike. Did they ever work? They must have been around a 35 bhp bike even in their early iteration and they seem to have basically the same set up as the 12 bhp Bullet.

[Norm]

Same clutch Simon from the early Bullets to the last of the Series11

[Norm]

Early Bullets might have had 3 plates but the only step up was when the went to 4 plate, not sure it made that much difference

[Bullet Whisperer]

One thing to bear in mind with the twins having the same clutches as the Bullets is they were driven by a much larger engine sprocket than the singles, so the torque imposed on them would be less than if the smaller Bullet engine sprocket size were used, so the clutches on the twins would actually be under less strain than they would on a single of equal power. This means a twin can develop more power than a single without necessarily putting more strain on the same type of clutch. BSA raised the primary gearing over the other unit singles as one of the modifications for the B50 for this very reason and to give the gearbox an easier life as well, while handling much more power than the similar, smaller unit singles in their range.