Changing gear selector spring

[LeightonRB20]

My GP is jumping out of gear when under pressure, that is, when accelerating. I'm told that it is probably the gear selector spring. I'm sort of OK with a set of spanners, so is this something that I could tackle myself, or would it be beyond the realms of someone with a 'reasonable' amount of skills, or is it far too complicated? What do you think?

[Muppet]

easy; use kick start spring its stronger

[drunkmunkey6969]

Only one way to find out bud.....get stuck in!

[Chris in Margate]

Before attempting the strip down just convince yourself that the cables are adjusted correctly and that the external selector arm is not catching on anything and is free to travel from 1st to 4th without obstruction.
That said it's not a 5 minute job and you'll need some tools like clutch compressor, clutch holder etc. Read Sticky's book on this section and then DO IT. It's initially a little daunting but not that difficult.

[10 inch Terror]

As said, it's an easy job, but probably one of the most time consuming, and will require almost all of the Lambretta workshop tools. The clutch, gearbox, rear hub and lay shaft need to be removed ( it can be done with the lay shaft in situ, but is very akward ). If, you have all the tools required, then it is an easy job.

[Daggs]

I would suggest it's not a task for the novice Lambretta mechanic. If you have a mate who has experience? Get him involved and learn as you go.

[wack 63]

Whilst apart it would be best to change the selector(sliding dog) and carefully check the gears internal cut outs where the dogs engage for any rounding off on the edges.

[HxPaul]

Before attempting the strip down just convince yourself that the cables are adjusted correctly and that the external selector arm is not catching on anything and is free to travel from 1st to 4th without obstruction.
That said it's not a 5 minute job and you'll need some tools like clutch compressor, clutch holder etc. Read Sticky's book on this section and then DO IT. It's initially a little daunting but not that difficult.




Also if you've got rubber gators on the gear cables,these can compress when you select a gear and sometimes push the gear swivel causing it to turn and drop out of gear.

[mick1]

bearing in mind it might not be the spring !! it could be a worn gear or selector or other........

Might be worth phoning round and seeing what the cost for a strip down and re-build is and off setting that against the time, inconvenience, cost of new tools, potential balls up, etc.

[LeightonRB20]

Thanks for the input, chaps. I'm pretty confident that it's not the cables, based on the fact that when I slackened them off, the problem became worse. My theory being that the tighter cables helped to keep the selector in position?? I think I'll have another look to be absolutely sure, then get some prices.