Can LI 125 Crank Be used in Jet 200?

[LittleBritishCar]

I need a crank for my Spanish Jet 200 rebuild and have a very good condition Innocenti LI 125 crank. Can it be used? If so, do I need shims or anything to make it work?

Thanks!

[Grumpy225]

Same taper, same stroke and same rod length so that part checks out.


Have the crank check for true and make sure it's cleaner than a clean thing before installing.

[LittleBritishCar]

Right on, that is what I thought. Thanks.

[Doom Patrol]

I say, I say there boy. Why'd you want to use an LI crank with a heavy flywheel like that, boy?

[Adam_Winstone]

^ ditto

[LittleBritishCar]

Yeah, agreed. I am going to order a new crank.

[Adam_Winstone]

I hate to say it now, if you've gone and bought yourself a new Jet type crank, but the flywheel comment made suggests that the point being made was, 'Why stick with a Jet/LI/SX thin taper crank on a 200cc machine, when history has proven these to be weak, over and over again?' Certainly, this is the meaning that I was saying 'ditto' to.

If you do a search for 'weak taper', 'sheared taper', etc then you should find plenty of information on my Innocenti changed the design of the LI/SX crank to have a much stronger taper. I've had to knock a number of sheared crank ends out of flywheels and this has been covered many times on different Lambretta/scooter forums.

If you have simply replaced the Jet crank then I wish you well. Many have given a lifetime's good reliable service, whilst others have failed within the first couple of year's use. Hopefully, you'll be lucky.

Adam