France North AR Posted March 16, 2019 Share Posted March 16, 2019 Hi everyone,I'm currently trying to find the best jetting for my S2 (Pre Xflow with fast road cam on twin 40DCOE) I found plenty of infos about Xflow jetting but nothing about Pre Xflow.Trying Xflow jetting as basic set up is OK but far from perfect. I will be very happy if you could share your jetting to help me to find the best set up.At today best for me is: Choke 30 fuel 125 / F16 / air 160 Pump 35 Idle jet 45F9Thanks for your help ! Link to comment Share on other sites More sharing options...
Tazio Posted March 16, 2019 Share Posted March 16, 2019 Dave Gemzoe is your man for X flows, he lurks on here and over on Facebook Link to comment Share on other sites More sharing options...
elie boone Posted March 16, 2019 Share Posted March 16, 2019 Nicolas, can you describe the improvement you are after, BTW what is the float level ? Link to comment Share on other sites More sharing options...
orangepeel61 Posted March 17, 2019 Share Posted March 17, 2019 You haven't said what idle jets you have (as a guide, for a 1700 Supersprint they should be at least 50F9's) Link to comment Share on other sites More sharing options...
France North AR Posted March 17, 2019 Author Share Posted March 17, 2019 You're right I updated first post (45F9) Link to comment Share on other sites More sharing options...
7 wonders of the world Posted March 17, 2019 Share Posted March 17, 2019 45 F9 should be fine for that spec,You really need to get this on set of rollers and see what your engine needs, rather than trying to copy someones else's spec, there are too many variables which could and will after performance, efficiency, and safety and longevity of your engine, including looking at your ignition curve / map depending what set up your running. Link to comment Share on other sites More sharing options...
France North AR Posted March 17, 2019 Author Share Posted March 17, 2019 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 ! Link to comment Share on other sites More sharing options...
7 wonders of the world Posted March 17, 2019 Share Posted March 17, 2019 Assuming everything else is correct then the idles are straight forward, screw them all closed and then open each one 2 full turns and start up, adjust from there in 1/4 turn on each one in order to get a smooth idle.If your using second hand jets make sure you check them which gauges as many jet are reamed or drilled oversize, some even soldered and re drilled don't rely on the numbers stamped on the jet alone.If your needing to swap tubes (which it sounds like you need) then your best getting this done on the rollers. Link to comment Share on other sites More sharing options...
Area Representative JMB7 Posted March 20, 2019 Area Representative Share Posted March 20, 2019 NicoYou have a mail...Copy of page 219 Tony Wheale..JMB7 Link to comment Share on other sites More sharing options...
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