Im having a heck of a time with my main jet. When I bough it had a 300 and ran ok. Then I put the vforce reads cage in cleaned the filter and had to go up. I put a 320 in and it got better but still stalled and spuddered at top end a little then went to a 330 got a little better then a 340 and its almost there but seems like it could handle bigger. I know that sounds realy rich for my mods but it keeps getting better with each increase in jet size. Im also at 2000” Once I tride to go down in jet size but it got a lot worse so I know Im headed the right direction going larger but dang do I have an air leak? I have the neelde on center clip. I moved the needle one clip richer but then my midrange got week. SO im pritty sure I got everything good exept the main. I read guys with port and polish that don’t run that large of mian. I just changed the main seal and not leaking oil from eather side of crank. And used the new seals that came with the vforce read cage. Could low compression cause this too? Not sure if the guy broke in the wiseco piston good. This is my first kick start 2 stroker so I cant tell if it has enough compression by feel. I can push the kick by hand but its pretty hard. Don’t think I could start it that way.
jet size help please
- Thread starter tonywayne
- Start date
compression test would be a good start, i have a 30mm mikuni and run that size of jets with no air leak, every motor and carb are different, if it's not leaky and it runs better rich, richen er up but i'd do a compression test if i were you just for knowledge sake
every machine is diferant so running that high o njettin wouldnt surprise me.. if herd of guys runnin a fmf and no lid being good on a 250
that seam kinda high i would deff check your compression bc i am running a 300 main in a30mm mikuni flat slide carb with uni filter no air box timeing advance heavy port work reeds fmf pipe sst. but all bike are diff so.
awk08 got a point if u can spray carb cleaner around there when the bike is a iddle and it bike rpms rev up when sprayed around gasket more than like there your air leak
