jlsparky7 Posted December 6, 2011 Report Share Posted December 6, 2011 4 mill, pro circuit pipes, stock carbs, modded air box with lid, K&N, bored .0030 wiseco's. head shaved .0030, running 94 oct 40:1, +4 timing A 290 is spot on at 70 degrees, if i ride around 30-40 degrees whats a good starting point to bump the jets to. 320-330 im thinking? Quote Link to comment Share on other sites More sharing options...
swhitey917 Posted December 6, 2011 Report Share Posted December 6, 2011 (edited) 4 mill, pro circuit pipes, stock carbs, modded air box with lid, K&N, bored .0030 wiseco's. head shaved .0030, running 94 oct 40:1, +4 timing A 290 is spot on at 70 degrees, if i ride around 30-40 degrees whats a good starting point to bump the jets to. 320-330 im thinking? I have always heard for every 15-20 degrees you change jet size so if you are spot on at 290 @ 70, I would start off trying 320's and do a plug chop and go from there. Edited December 6, 2011 by swhitey917 Quote Link to comment Share on other sites More sharing options...
jlsparky7 Posted December 7, 2011 Author Report Share Posted December 7, 2011 Alright awesome. Thats what I was thinking. A couple more opinions would be great, placing an order this week. Quote Link to comment Share on other sites More sharing options...
ginger Posted December 7, 2011 Report Share Posted December 7, 2011 i have 310s, but my motor isnt as modded as yours. Quote Link to comment Share on other sites More sharing options...
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