cbudweiserc Posted March 6, 2014 Report Share Posted March 6, 2014 Hey guys, about to get my tune on and just curious/want/need some opinions about pilot jetting.... Here's my rundown... I'm .020 over, wiseco pistons T5 pipes/silencers K&N clamp on's and I have a set of VForce V4's on the way. Right now I've got my mains at 330 (save the that's way to rich, I'm running the same setup as my buddy running 310's and he's lean popping left and right)--->hope that didn't come off as, Hey I'm a know it all....Anyways, so for the new V4's what would be a good size to run? I'm away from my shop right now so I can't check to see what's in there now but I guess that would be a good starting point. Anyways, anyone with V4's or V3's care to chime in I'm all ears. Thanks! Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted March 6, 2014 Report Share Posted March 6, 2014 27.5 or even 30 pilots Main jets that your numbers reflect shouldnt be that high if its not ported 270-290 range more than likely Quote Link to comment Share on other sites More sharing options...
sheerider11 Posted March 6, 2014 Report Share Posted March 6, 2014 Your buddy's lean pop may be a result of something else. Might be bad electronics, maybe a air leak. You guy should start looking into that. But like surf said word on the streets is the pilots need to be brought up. Quote Link to comment Share on other sites More sharing options...
uman1030 Posted March 6, 2014 Report Share Posted March 6, 2014 27.5 or even 30 pilots Main jets that your numbers reflect shouldnt be that high if its not ported 270-290 range more than likely ↑↑ this 30 pilots especially with vf4's . 330 main is probably perfect... for 0° @ sea level. Something else is up with your buddies bike. If its lean popping with those mains then he has OTHER issues. Electronics or a descent air leak. Leakdown test would at least rule out an air leak which is the most common cause for needing such large jets on such a small motor. Quote Link to comment Share on other sites More sharing options...
swhitey917 Posted March 6, 2014 Report Share Posted March 6, 2014 Yea something seems up with your buddies bike. I had a bike with similar mods and I ran a 280 main during the summer weather. And depending on how cold it got in the winter would work up to a 310. Running a 330 and still lean popping definitely seems like an air leak issue somewhere leaning out the mixture. Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted March 6, 2014 Report Share Posted March 6, 2014 300 mains 30 pilot 4th clip on toomey needle , rob I was thinking the same thing air leak or mechanical issue Quote Link to comment Share on other sites More sharing options...
wayne_smith97 Posted March 6, 2014 Report Share Posted March 6, 2014 He could read the plugs to see if one cylinder is running lean Quote Link to comment Share on other sites More sharing options...
swhitey917 Posted March 6, 2014 Report Share Posted March 6, 2014 If running boost bottle, check around the rubber boots where it mounts. Seen a lot of air leaks around that area in the past causing lean issues. If so, fix it and ditch the boost bottle for a stock crossover tube. Quote Link to comment Share on other sites More sharing options...
cbudweiserc Posted March 7, 2014 Author Report Share Posted March 7, 2014 Thanks for the input and ideAs for my buddies bike. We'll look into it. I'm basically at sea level (200 ft) so maybe my calculations were off but either way, I gotta go get pilot jets so I'll snag some 300's and 310's and give those a try for the mains. Quote Link to comment Share on other sites More sharing options...
swhitey917 Posted March 7, 2014 Report Share Posted March 7, 2014 Thanks for the input and ideAs for my buddies bike. We'll look into it. I'm basically at sea level (200 ft) so maybe my calculations were off but either way, I gotta go get pilot jets so I'll snag some 300's and 310's and give those a try for the mains. It never hurts to have extra jets laying around. Quote Link to comment Share on other sites More sharing options...
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