U-LOSE Posted July 13, 2009 Report Share Posted July 13, 2009 okay just blew up the shee In the process of rebuilding. But I need help with the main jets. It is a 4mil stroker with stock carbs ,t5 pipes, k&n air filter no lid on the airbox. cool head 20cc domes 160 psi compression. The altitude is 700ft above sea level and 80 degree air temps. I think it blew up because of being lean . So what would be a good starting point?? Help please Quote Link to comment Share on other sites More sharing options...
firebanshee Posted July 13, 2009 Report Share Posted July 13, 2009 okay just blew up the shee In the process of rebuilding. But I need help with the main jets. It is a 4mil stroker with stock carbs ,t5 pipes, k&n air filter no lid on the airbox. cool head 20cc domes 160 psi compression. The altitude is 700ft above sea level and 80 degree air temps. I think it blew up because of being lean . So what would be a good starting point?? Help please I would start at a 340 mains and and go from there you should end up at 330 or a 320 and 27.5 on the pilot,start with the needle on the middle clip and around 13/4 to 2 turns on the air screws. :cool: Quote Link to comment Share on other sites More sharing options...
U-LOSE Posted July 13, 2009 Author Report Share Posted July 13, 2009 I would start at a 340 mains and and go from there you should end up at 330 or a 320 and 27.5 on the pilot,start with the needle on the middle clip and around 13/4 to 2 turns on the air screws. :cool: okay thanks I was thinking around 320. The guy I bought it from had 270 mains in it I think that's why it when boom from being lean. Quote Link to comment Share on other sites More sharing options...
x_doug_x Posted July 13, 2009 Report Share Posted July 13, 2009 okay thanks I was thinking around 320. The guy I bought it from had 270 mains in it I think that's why it when boom from being lean. 320 may be a little lean for you. i'm running 320s in my bike as mains and 30s as pilots,, it's not running very rich and it'sbasically stock. it has a newrebuilt top end i put in, t5pipes/silencers and the airbox removed. filters on back of carbs. that's it and i'm 800 feet above sea level, i'd at least start with 350sand go from there. Quote Link to comment Share on other sites More sharing options...
mazuullaa Posted July 13, 2009 Report Share Posted July 13, 2009 I just got done putting a dune ported 4 mil together with t5's, stock carbs, pods, and 155 psi compression. Close to sea level I started with 30 pilots middle clip on the needle and 360 main jets. Its fat but does rev fairly clean I plan to work my way down from there. Quote Link to comment Share on other sites More sharing options...
fastrthnu Posted July 13, 2009 Report Share Posted July 13, 2009 320 should be money Quote Link to comment Share on other sites More sharing options...
U-LOSE Posted July 13, 2009 Author Report Share Posted July 13, 2009 it has 30's in it for pilots and it always Idled good (for the short time I had it) lol I really appreciated all the help. Perhaps I'll start in the 340 range to be fairly safe and work from there. Quote Link to comment Share on other sites More sharing options...
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