I have a 250r I just put a 38mm PWK on and I cant get it to run right at all the carb is new from ESR it came with a 172main,52pilot,deg needle on 3rd, it sputters and spits half way thru the power band and pops and sputters big time on the top end I put a 178 main in and still does the same. I put the stock carb back on due to sand drags tommorow and it runs great im sure it will run even better if I could get the 38mm tuned Help Please!!


Mods are V-Force 3 reeds, fresh bore (stock) with Pro-lite, FMF gold,ct silencer, head shaved .010,Race gas (110) with R50 40:1


Thanks

 

well, if it spits and sputters up top, you need a smaller main jet, not a bigger one. try something in the high 160s and see how that works. make sure your idle mixture is right first though, then the mid-range, then the top end. the idle and midthrottle settings will affect top end a little bit. good luck

 

ok thanks as far as idle mixture goes whats the best way to get that dialed in then what go to the pilot then main?? Thanks again