How not to B33!

[idie]

B31 has 3 plates a B33 has 4 and a A7 and A10 has 5 plates. Although I have always found 5 plates on a B33.

[Derek996]

The 6 spring clutches came in 3 variants, 3 plate for the B31, 4 plate for the B33 and 6 plate for the A7, A10 and 500 Gold Star. I'm not sure which version was fitted to the 350 Gold Star. My B32 has a 3 plate clutch and since I have a few spare plates I was going to try it with an extra friction plate and corresponding plain plate but although the basket will accept more plates the central drum won't. I do have a complete 6 spring clutch but I'm saving that for now.

[neil1964]

What is the height of your centre basket and outer chain wheel
As Derek points out it is the centre basket (and pushrod length) that decides if you can fit 5 friction plates or not. I ran 4 plates on my B31 and later ZB
I have 5 on the 'Goldie'.
Modern plates are thinner than the cork variety

[Dan_B33]

Hi, thanks for your fast response!
I haven't measured hight yet but tried to fit 5 an later 4 plates (old ones). Looks far better with 4 shall work fine (second picture).
Other option is to fit higher inner basket from old clutch to have 5 plates. Still if it can run on 4 plates I would stick to this. Tis second hand clutch from UK looks far better...and I will have new plates

[Dan_B33]

I think center basked can hold either 5 or 4 it's high enough.
Sorry for the pictures sizes...still need competence development over that area.

[neil1964]

Based on the last pic you have too many plates, as when you lift the plate it will disengage from the tongues on the inner basket and it will spin out of location.

Your second picture looks correct.

[Dan_B33]

Yes, the last picture is with 5 plates. The one in the middle is with 4 plates and I think tongues are far out to secure clutching....what do you think?

[Rog1]

This'll either confirm or confuse, but here goes. My old 6 spring clutch, now replaced with a 4 spring, measures up as follows:

Inner basket     1.575"/40.0mm deep
Stud length      2.075"/52.7mm
Outer basket    1.413"/35.9mm

There are 4 friction plates and 5 plain plates.

[Dan_B33]

Thanks Rog!
Amazon failed to deliver my clutch friction plates and oil pump spindle....
I have put on pause clutch work.
Looks like I will be able to put engine back int piece ( I know would be better to fit oil pump first ).
I gave finally made my magneto fit and sparking!
Bellow snap .
Oil seal is metric! Shall do the job!

[Dan_B33]

I have made my magneto working like charm. Now time to fit dynamo.
I have new fibre gear....both magneto and dynamo spin freely when separated. . When joined they grind. Too tight fit? See the picture. How to solve that? Some shim on the dynamo bed (between dynamo an magneto?

[Roy]

Through my experience  ,pattern parts again assumed the part you bought is a repro , the mag /dyno and bsa A10 fibre gears are  a problem ,pitching , I have seen them run like that and stripped all teeth of and what a mess ,

[Dan_B33]

Thanks Rog!
Where I could source fitting (proper) fibre gear?
Any suggestions?

[neil1964]

I think I have a spare. Not NOS by any means but an original Lucas/BSA part nonetheless.

I'll have a look when I get out into the garages later.

[Dan_B33]

Thanks Neil!
Please let me known....w can arrange all  via my brother (who liver in Preston's)
Cheers
Dan

[neil1964]

I've got three spare
One narrow one with holes in the friction disc and another with chewed edge and one that is very good.
You can have it for price of postage.
If you pm an email address I can send you pics to be sure it is what you need.