Final drive ratio

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Suede Ed
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Posts: 217
Joined: Tue Jan 13, 2009 2:01 pm
Main scooter: SIL GP185
Location: Black Country

Thu Mar 18, 2021 3:26 pm

Gents, im building a 200 with an Italian Li 150 gearbox, it will run a 30mm del thru a bgm clubman, what final drive ratio would work? I never ride 2 up.

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garry inglis
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Joined: Tue Jul 21, 2015 8:04 pm
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Main scooter: ts1 230 and rb200
Location: darlington

Thu Mar 18, 2021 3:45 pm

Standard 46x15 will work well

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Warkton Tornado No.1
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Posts: 250
Joined: Mon Oct 17, 2011 6:16 pm
Main scooter: Lambretta SX200

Sun Mar 21, 2021 12:04 am

SX 200 is a good ratio IMO to suit a 200, which is 4.8.

Just by adding a 16T front sprocket to your Li150 'box you'll get 4.9 which is a little lower overall, but the right place to be, rather than over geared. You might even find that too low, which would mean your engine could pull higher. That is a good thing to discover, even if there's work involved IMO :D

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Joined: Sat Apr 25, 2015 1:34 pm
Main scooter: Lambretta

Fri Mar 26, 2021 10:36 am

I've a similar set up and mine will pull 17-47 (4.7) I tried with 16-46 (4.9) and it was very good, I only swapped because I had the sprockets. Had I of had to buy new sprockets I'd not have bothered it isn't £100 better!

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