classic motorcycle forum

Clutch End: OD :20.45mm or 0.808" and inside the splines is 17.25mm or 5.07".

I also have a AMC clutch and it is a good fit. Can you confirm that my mainshaft is the Plunger one ?
Do you have the part number for it ?

Please let me know if I can be more help. I'm in sussex where are you located ?

Regards.

Google Paddock starters or solo starters. They can be purchased but cost lots.
I thought someone was going to make me one but have not heard from then since xmas.
They are quite tricky to get right. Kind regards

Thanks for your advice and info.
I have now found out that to use a Norton clutch on a BSA RRT2 gearbox, it must have had a BSA A7 plunger mainshaft fitted, which has a splined end the same size as a Norton mainshaft.
I have the measurements of the spline on a new Norton shaft taken from a Haynes manual, but unfortunatly do not have the measurements of the A7 plunger shaft, just to make sure that they are identical in size.

I would be very grateful if anyone could give me the OD diameter of the spline on a A7 plunger shaft, so i could then measure the shaft in the bike, before shelling out over £100 for a new shaft if needed

I have previously been informed :The only thing we had to do was change the mainshaft for a matchless one, it was common knowledge in the day. Maybe BSA internals were made by Burman as well, as it seems too much of a coincidence that they fitted.
you can fit a plunger mainshaft out of a Beeza A10 into a BSA swinging arm box to fit an AMC clutch which has the same spline. Burman B52 mainshafts also have a similar spline as the AMC box to fit the later clutch (which i have done) but it isn't a perfect fit as the spline is a little sloppy for my liking!
"BSA gearbox but mainshaft replaced with a matchless one ?"
I had a look on the web and can't find back-up for what I said, but I feel certain that it was a matchless shaft. maybe it was the A10 rigid shaft and I am wrong.

A little confusing for me.

Can any one clarify whats wot.