Elie, It is my blue road S2 I'm just after a "round" tractable engine for road use. It is a 120E block so 1499cc (I tried 32 choke but it is perhaps too much for this engine capacity?) At the moment it is rough around 2500/3000rpm (no spitting carb or exhaust) but looks too rich (little black exhaust smoke at first pedal action and black sparks). Problem is anything leaner is even worst. Could you let me know value to check about float level ? Also I'm interested about advice to set up idle screw. Thanks !