White1996 Posted July 8, 2016 Report Share Posted July 8, 2016 So ive started a "build". Right now i've got stock carbs, k&n pods, v-force 4's, no spacers, and CPI pipes. I went through the carbs. I bought the bike with PSI pipes, air box in place with a foam filter. The main jet was at a 220, pilot a 25... I'm at 4800', in UT. I threw in a 280, cause thats what I had... kept the pilot the same... Took it for a quick putt, and the bike is stuggling. Question is... where is a good place to start? Is 280 too big? 25 too small? Thanks for the help guys! Quote Link to comment Share on other sites More sharing options...
guns4children Posted July 8, 2016 Report Share Posted July 8, 2016 I'm guessing 27.5 would be the next step. Although I haven't had stock carbs for a long time I think that's what most with pipes run. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted July 9, 2016 Report Share Posted July 9, 2016 With the mods that were on it and stock jets, I'm surprised it even ran without melting a hole in a piston. Have you verified that there is even life left in the motor with a quick compression test? With your mods, you'll wanna be at least 27.5 pilot, needle second clip from the bottom, 290ish main. Quote Link to comment Share on other sites More sharing options...
White1996 Posted July 10, 2016 Author Report Share Posted July 10, 2016 Motor holds 110 psi. I thought the jetting was low.... What psi should a frsh motor have? Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted July 10, 2016 Report Share Posted July 10, 2016 125 at sea level with stock head Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted July 10, 2016 Report Share Posted July 10, 2016 Those jets don't suprise me at 4800 ft with pods try 240-260 main and do a chop Quote Link to comment Share on other sites More sharing options...
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