Gear Compatibility

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Posts: 2
Joined: Fri Jul 13, 2018 4:32 am
ebay user ID: grandnat86
Main scooter: 1964 LI125

Fri Jul 13, 2018 1:43 pm

Hi all, i have a '64 LI 125 and need to replace the gear cluster and 3rd gear but I'm having trouble finding parts.

Is it possible to replace the full set of 4 free gears and the gear cluster with a set from a different model Lambretta, such as an LI 150 gearset or something similar? These seem much more available and the gear ratios are similar.

I'm just not sure how interchangeable the gears are from the different models as long as I replace all of the gears together?


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registered user
Posts: 4432
Joined: Sun Mar 08, 2009 12:01 am
Main scooter: Lambretta Series 1
Location: East Yorkshire

Fri Jul 13, 2018 3:38 pm

Gear boxes are interchangeable but you may need to change sprockets to get the correct final drive below helps ... -chart.xls
As my Dad used to say "Each to their own lad"

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Posts: 980
Joined: Fri Dec 06, 2013 1:58 pm
ebay user ID: panhead_5
Main scooter: lambretta Li 150
Location: Halifax,Yorkshire

Fri Jul 13, 2018 4:24 pm

If you change the cluster and the 4 gears,theres no problem.Some of the loose gears are interchangable,but not all.If you change the gearbox,stay with the cluster and 4 gears and you wont go wrong.

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Posts: 676
Joined: Wed Feb 01, 2012 2:00 pm
Main scooter: Li230 S3
Location: Perth, Western Australia

Sat Jul 14, 2018 11:31 am

Just be aware that the shimming may be different and that there is a considerable difference in the final drive ratio between the LI125 and the LI150. Dropping the front sprocket from 15 to 14 will give a closer match, but then you will have to consider using a pull down chain tensioner.

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Posts: 208
Joined: Wed Jan 07, 2009 12:55 pm
Location: Dorset

Mon Jul 16, 2018 11:07 pm

Sure I have 125 cluster in my garage.


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