Not that I am an expert but when we opened up our stock exhaust we had to turn out the air to fuel mixture screw to lean it up a bit on the idle end of the spectrum. What engagment are the three red springs, I know we went with purple and got pretty good results.
Let us know what you end up doing, that is good info to get out there.
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2002 Honda 400ex, with a Fritz Race Motor and full MX set up
2003 90 mod with Blaster chassis, Fritz Race Motor and MX set up
2005 Eton 90 stock limited with Fritz Race Motor/ 5 series point champion
2007 and 2008 D23 90 stock limited class champion
2007 and 2008 hurricane hills points champ 90 stock limited
2007-2008 Amsoil Sandbox arena 90 stock limited champion
2008 D23 Youth Production 4th in class,2008 Hurricane Hills champ
2008 Amateur National Championships Moberly MO/ 10th place
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