BSA Bantam Gearbox Question.

[nickjaxe]

Hi guys...I know my bike is not a vintage bike but you guys are so knowledgeable I thought I would ask.

Its a 4 speed B175 1970.

I am putting the 2 stroke engine back together after fitting new seals and roller bearings.

Got the crank end float spot on with 4" thou end float....but when trying a test assembly before applying on the case sealant.

I found I had no end float on the gearbox shafts...in fact it is ever so slightly putting a pre load on the shfts if I bolt them up...

I can see no way of adjust ment...is this clearance normally pre set...

I am presuming there should be some??

Be grateful for any advice.

Nick.

[chaterlea25]

HI Nick,
Its likely that one of the replacement bearings is not seated fully home?
or a washer or spacer misplaced ?
HTH
John

[nickjaxe]

Hi John..is there normally some means to adjust end float in these type of gearboxes...its my 1st ever bike...seem odd that its not adjustable but I can see no means of it.

I will looking into your idea.

Nick.

[mark2]

it is a vintage bike

[nickjaxe]

Its ok now guys...I opened the case again...gave the mainshaft a few whacks with my rubber mallet...also the output gear on the other end...tried it again...hey presto 4 thou end float...

Thanks John.

Nick.

[john.k]

A big hammer always works.Happy New Year .Regards John

[nickjaxe]

All the best John.