Good evening all,
I hope you may be able to advise me regarding mainshaft endfloat please.
I stripped the gearbox down (it was really noisy when I bought the bike) only to find that it appears to have suffered some major trauma!
The inner race of the mainshaft bearing at the kickstart end had shattered and was in about four pieces. Additionally, the lip on the inner side of the inner cover, where the small washer sits had a crack around it.
I had to remove the cracked section before it fell out. It appears that at some point in time, the gearbox has been assembled incorrectly, I suspect with the small spacer and then a thrust washer the wrong way round, the inner cover taking the brunt of clamping against them.
upload image
I milled the face flat but the damage became more apparent.
upload image
Thankfully, the bottom of the bearing recess where the bearing sits is fine. So, now I’m left with a bigger diameter hole where the thrust washer would normally run up against. , my plan is to manufacture a special spacer / thrust washer that fits between the face of first gear and the inner race of the bearing. I can machine it to a thickness which will provide the correct endfloat.
That’s the first bit, does that seem like a plan?
Part number two - I’m struggling to understand what controls the endfloat of the mainshaft or should there be none?
If I give the mainshaft a shove from the sprocket end, then from the kickstart end I have approximately 1/8” movement. At first, I thought the mainshaft endfloat may have been limited by the kickstart ratchet assembly, now I’m thinking it’s controlled at the other end once the clutch is fitted? If that’s the case, im struggling to comprehend unlessI I’ve got some other bits missing!
As always, any help appreciated.
Gino.
email (option): gino_kerekes@yahoooo.co.uk