A kit to take Lambretta small block 125-175cc motors out to a more competitive 200cc, the Rayspeed RB20 claims to be one of the most advanced available. It includes the 66mm bore cylinder, a Wossner piston kit, a four-petal dual reed block, gaskets and an inlet manifold suitable for a 34mm carb. Bolt all that lot together with a 58mm stroke crank and fit it with a 116mm conrod and you achieve the promised 200cc. The Rayspeed kit fits Lambretta GP; Series 1, 2 or 3; SX and TV models and has a retail price of £435.
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