DirtRider Posted July 8, 2004 Report Share Posted July 8, 2004 im gonna advance my timing +3 or +4 i lightend my flywheel. and am shaving the head .025 currently have stock carbs fmf fattys tors removed and i think .04 over bore. i currently have 260 mains and i thnk 25 pilots. how will these new mods affect the jetting and how main sizes will i have to go up? some one on here seemed to think that those mods shouldnt require rejeting but it says on the FAQ that advanced timming needs to be jetted for. thanks Quote Link to comment Share on other sites More sharing options...
sredish Posted July 8, 2004 Report Share Posted July 8, 2004 For those type of mods, rejetting isn't necessarily required, but it "could potentially" cause it to run a little hotter and maybe want a little more fuel. This is why, after any mod, it's necessary to run a WOT plug test to verify whether it will be needed or not. In most cases, just moving one size is all that is needed, if anything is needed at all. Doing them all at once, I'd probably suggest going up one size and then checking. Later. Quote Link to comment Share on other sites More sharing options...
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