Honda cg 125 Front Sprocket.

[neptune8]

I fitted new chain and sprockets to my 2002 bike. On changing the front sprocket, I noticed there is some wear on the gearbox splines where the sprocket fits, allowing a bit of backlash. There is still some backlash with the new sprocket, but less than the old. The sprocket is retained by a plate which is a bit like a second sprocket without teeth, which attaches to the sprocket itself with two bolts. I don`t understand how this holds the sprocket to the shaft. To make things perfect would need a complete stripdown and a new gearbox layshaft. Has anyone else had problems like this? and if so, how was it resolved? Would fitting a new sprocket retainer plate improve things?
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Enjoy yourself, its later than you think

[Commuter_Tim]

We have a part time member, part time troll on here who had that issue with his 125 Varadero.
He had someone weld the sprocket to the output shaft, the result was visually hilarious.
Oddly despite bouts with static concrete objects, he still lives.

Disclaimer: I do not recommend you welding your front sprocket.

When are you noticing this backlash?
You mention replacing sprockets are you absolutely certain it isn't your chain?
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The above post is most likely nonsensical.

I ride a Bandit 600... badly.

[Nobby the Bastard]

[smallfrowne]

The sprocket is held on by the retaining plate because when you bolt it to the sprocket the plate is no longer lined up with the gaps in the splines - it's now 'stuck' on.

These splines though, how worn we talking? Pictures?
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'90 VFR750; '89 NC30; '95 DR650; '89 CD250U; ~'82 CG125; ~C90

[Tamsin]

It's pretty normal for a small amount of backlash on the shaft (well, on the 3 that I have encountered!) So I wouldn't worry too much. But again, how much play is there!?

[neptune8]

The play/backlash is not excessive. I replaced the chain along with both sprockets,. Someone mentioned welding the sprocket to the shaft which in an extreme case might be justified if the splines are totally shot, as when the sprocket finally wears out, you could still remove the end of the shaft with an angle grinder, strip things down and replace the layshaft. I feel that the design of the thing is poor. I may fit a new retainer plate, as they are very cheap, less than a fiver. The other cause of transmission backlash I have, is my cushdrive rubbers. I replaced them about 1,500 miles ago, but made the mistake of fitting pattern parts as genuine ones are £60 a set. I think a new wheel would be the answer here. as the wheel has other problems anyway.
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Enjoy yourself, its later than you think