jimbo1986 Posted August 22, 2012 Report Share Posted August 22, 2012 so my setup is 421 serval v force reeds, cpi sb inframes, 34mm tm carbs(got a good deal on them), domes cut by andy not sure what size, +4 timing and im at about 1300ft. I run av gas at 32:1 ratio and the jetts i have in it now are 50 pilots and 330mains. Now if someone could give me a good starting point that would really help. With the jets in it now it will start to hit the band but then seems like it hits a wall. I need some help from u guys because u guys always seem to help out. I just wanna ride this thing Ive been working on getting it done for months now!!! Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted August 23, 2012 Report Share Posted August 23, 2012 try some 280's and work down. get some 250, 260,270 and 280 jets. on the servals, id back the timing down to stock. especially if you dont know what size domes they are. do a comp test, see where youre at. Quote Link to comment Share on other sites More sharing options...
shakar Posted August 26, 2012 Report Share Posted August 26, 2012 (edited) so my setup is 421 serval v force reeds, cpi sb inframes, 34mm tm carbs(got a good deal on them), domes cut by andy not sure what size, +4 timing and im at about 1300ft. I run av gas at 32:1 ratio and the jetts i have in it now are 50 pilots and 330mains. Now if someone could give me a good starting point that would really help. With the jets in it now it will start to hit the band but then seems like it hits a wall. I need some help from u guys because u guys always seem to help out. I just wanna ride this thing Ive been working on getting it done for months now!!! i run a trail ported stock stroke at 1000' , 330 main and 27 1/2 pilot jet on 28mm mikuni TM's. your main may be alil smaller as there bigger carbs but id do 27 1/2 pilot or 30 max on the pilot and slowly drop your 330 main if its fat . but i dont think thell be to much or a change for you on top......... goodluck and let us know what you ended up with and how she goes Edited August 26, 2012 by shakar Quote Link to comment Share on other sites More sharing options...
jimbo1986 Posted August 26, 2012 Author Report Share Posted August 26, 2012 well i got to play with it alil this weekend and i drop my mains to a 270 and it seems to pull alil better but i am going to take it this wk down to the dirt strip and refine it. Its seems alil strange that its still rich with a 270 jet but maybe im thinking to big i guess. Now i think my polit is to big at 50 it smokes alot at ilde and kinda stumbles on the low end but it will idle. What is a good rule for choosing a polit jet ? If anyone could give me some more input i would thank u . jetting isnt my strong point and thats y i turn to u guys. If anyone thinks 270 r too low please let me know. My compression is 164 and 163 so andy told me to keep the timing adv at +4. Thanks guys for helping!!!! Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted August 27, 2012 Report Share Posted August 27, 2012 check plug caps and leads, etc as well. just incase you have two probs. Quote Link to comment Share on other sites More sharing options...
jimbo1986 Posted August 29, 2012 Author Report Share Posted August 29, 2012 Thanks I checked the the caps infact I replaced them and same thing. so im guessing it just doesnt need big jets. What do u think about the pilots? Quote Link to comment Share on other sites More sharing options...
dirtydownunder Posted August 30, 2012 Report Share Posted August 30, 2012 how do the plugs look ?, pilots should be ok, im running 50's. but you being higher up could need maybe 42-45 pilots. have you tried new plugs with the 270's ? from 330 to 270 should be a big difference. try some 260's. but check the plugs, make sure it isnt too lean. pull the needles out, see where they are at. the needle should be a 5FP-17. what are your air screws at ? have you checked pick up gap and resistance, and checked coil ? Quote Link to comment Share on other sites More sharing options...
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