Li125 special gearing

[Leviblue]

Morning all could you please give me some advice on gearing my li125 special it has a 175cc iron head with standard dellorto carburettor and 42 clubman exhaust it has a 15 drive sprocket seems to be very high reving screaming at 48 mph .cheers mick

[holty]

probably the first thing i would try is a 16 front sprocket and see if your set up will pull in top gear ok, there are a serious amount of options, my pal has a 175 and he has fitted a close ratio gearbox and with a bit more tuning he is running a 19 front sprocket, a set up he realy likes, that is running an expansion exhaust which does give more power higher up the rev range.

[Scoot]

You need to check what gear box and what sprockets you have front and rear.
This link will help you work out what gearing you currently have. I think you should be looking at a ratio of about 5.2
https://www.scooterhelp.com/tuning/lam.gear.calc.html

18/47 with a 125 special gearbox.

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[YAMLAM]

hi,
if it is a Li125 special gearbox ( same as Gp125/Gp200)then it will be screaming on 15/46(6.13 o\all )sprockets. Harry Barlow recomended 18/47 (5.22 o/all) on that box for two 175 conversions he done for me , both using small carbs and clubman exhausts.

[Scoot]

You will need an 82 link chain with 18/47. You could use 16/46 and see if the 175 pulls it ok


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[Grumpy225]

18/47 on that gearbox and life is good. I have that same set up on 2 bikes right now. One running a Casa 185 and the other running a Gori 200 top end. Good pulling ratios for in town with out the 4th gear drop off you commonly get with over geared bikes.

[Daggs]

16/46 is a cheap modification and in my experience works well on your set up.
You will need a stretched 80 link chain.

[YAMLAM]

16/46 will give 5.75 o\all, still be very revvy.
his set up should pull 5.22 quite easy.