NitroObsidian Posted June 20, 2016 Report Share Posted June 20, 2016 (edited) Hello , I will me soon build a 421cc engine. my setup : -68mm Kit Driveline Assassin's HP -Dome 21cc -Keihin 38mm pwk -Shearer out of frame with silencer -crank +4mm -Tassinari V-Force 4 Would you have any idea of mainjet ,that i must take ? I see a lot of setup 421cc with 35mm carbs and mainjet about 140~170. but with 38mm carbs ? i did not find. last question : i have a timing plate (at the moment +4° @stock cylinder). But with this setup ,How many can I put ? my use is only onroad. Thank you for your help Edited June 20, 2016 by NitroObsidian Quote Link to comment Share on other sites More sharing options...
guns4children Posted June 21, 2016 Report Share Posted June 21, 2016 Timing would all have to do with what kinda octane of gas you plan on running. As far as the jets go i don't see that bug of a difference between 35 to 38 I can't imagine the jetting would be off by much. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted June 21, 2016 Report Share Posted June 21, 2016 What kind of road , like daily driving or drag racing on asphault,. 21cc domes are gonna leave u needing over 100 octane fuel timings depends on intended use jetting will vary with compression/timing/fuel so know what you want to run..what pipes do you have? Quote Link to comment Share on other sites More sharing options...
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