Wildcardracing Posted April 18, 2013 Report Share Posted April 18, 2013 The 230's are a good starting point. If it has a high rpm bog then comes alive again, go up on them. This is a sign the PV's are opening too late. Remember, as you make changes to the pv you will also have to look at jetting again. If it feels like it's lacking on bottom to mid, the PV's could be opening too soon. Best time to consider some dyno time, these aren't as simple to tune as a cub or stock cyl motor. -Brandon Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted April 18, 2013 Author Report Share Posted April 18, 2013 Thanks. I appreciate the help. Do you have a good starting point for jetting? 472 cheetah Cpi small bores 93 octane mixed to 40:1 39 pwks with 8" k&n Sea level 75 degrees About 150 psi +6 timing Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted April 19, 2013 Report Share Posted April 19, 2013 Damn.... Brandon just let a great nugget of knowledge out right there. Not many threads with exhaust jet sizing if any. Quote Link to comment Share on other sites More sharing options...
hercalmighty Posted April 20, 2013 Author Report Share Posted April 20, 2013 Yep. Glad someone is willing to put it out there. So, does anyone have some insight on my jetting? Im thinking about starting with 48 pilot, cel middle clip, 165 main, 1.5 turns out on air screw. Quote Link to comment Share on other sites More sharing options...
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