BLOODRAGE Posted May 3, 2013 Report Share Posted May 3, 2013 Sounds like u have a top end bog due to a small main jet.was havin the same prob the other day and was getting hammered by a 392 stock stroke and I have a 10mil 472 monster.so I uped the main now the 392 eats my dust Quote Link to comment Share on other sites More sharing options...
Stonytony Posted May 4, 2013 Author Report Share Posted May 4, 2013 Ill try that. I have all sizes of main jets up to 500 even half sizes for that perfect tune. I just wouldn't think I was lean with color on the pugs. Can't hurt to go bigger. Quote Link to comment Share on other sites More sharing options...
BLOODRAGE Posted May 4, 2013 Report Share Posted May 4, 2013 Don't forget to try the air screw also Quote Link to comment Share on other sites More sharing options...
Stonytony Posted May 6, 2013 Author Report Share Posted May 6, 2013 Well I got it guys. I running 13:40 and it was a top end fuel issue. I just kept goin bigger main jet and 2 sizes bigger pilot one size bigger needle jet and lifted to needle one up and bam! One hell of a screaming machine. Only thing my plugs say im too rich but its the only way it will perform correct. I'm running 76 mph at 500ft dirt/grass drag race last Sunday. Placed 2nd. A 421 cheata cub bearly won. Half a quad. I won the grudge match for cash and walked away lol. Thx again for things to try Quote Link to comment Share on other sites More sharing options...
Pasi S. Posted May 7, 2013 Report Share Posted May 7, 2013 Good to hear you got it rigth. I had this same issue and it was lean from the mains. Quote Link to comment Share on other sites More sharing options...
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