Avanti gearing advice

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Location: London and Norfolk

Mon Feb 26, 2018 5:55 pm

Hi, just in the process of rebuilding my reed valved Avanti which has been running with 20 x 47 sprockets and Li125 Special gears (4.7) It did run really well and felt like it would pull higher. The rebuild includes a Grand Tourisimo 60/110 crank which I believe will add a little to the torque so was thinking of gearing for around 4.4:1 ratio. I will be buying an AF Road clutch and also have an Li150 (Italian) gearbox I could use.

Just wondering what others thoughts on gearing choices are before ordering. I note the AF clutches come in 46, 47 and 48 tooth so numerous ways of getting the top ration but what about the gaps between the gears?

Edit: Exhaust is a Franspeed Super Tourer
Carb is a 30 PHBH mounted on a ScootRs Atomic Ultimate reed inlet which uses the Yam reed block.

Any thoughts gratefully received 8-)

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