gearing for an RB20

Anything related to Lambrettas... ask tech questions, post helpful info, or just read and learn.
oshboshjosh
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Joined: Mon Sep 05, 2011 8:03 pm
Main scooter: lambretta rb20
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just wondering what is everyone running ive got 17/47 on a li 150 box at the moment but it dies when you drop it into fourth

cheers
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jonashford
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Posts: 445
Joined: Wed Oct 20, 2010 4:47 pm
Main scooter: Lambretta SX RB235
Location: GRIMSBY
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Depending on ur weight and that of the scooter 15 46 would work and allow the kit to rev nicely
sydduckett
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oshboshjosh wrote:just wondering what is everyone running ive got 17/47 on a li 150 box at the moment but it dies when you drop it into fourth

cheers
Had the same problem with mine with the same box as you, went from there to italian GP, better but massive gap between 3rd & 4th. Then went with indian GP box which has shorter gap, running 18x47 using a franspeed race. Pulls in 4th and hills no issue and still has power band on tap.... :D
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corrado
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Posts: 2588
Joined: Thu Jan 08, 2009 1:12 am
Main scooter: Lambretta GP
Location: Top of Blackpool Tower
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AF close ratio box with 18 x 47 [closer ratios than GP200], same as above with 5.22 should work well. 80 mph at 8,000 rpm and get there very quickly.
For a real hooligan, the AF box with 17 x 46 = 5.41, a wheelie machine, top end won't get much over 70 but it will fun getting there, not a rally machine, just a Sunday Harley killer. :mrgreen:
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