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Honda10
02-22-2008, 03:43 PM
Ok i unscrewed the main jet on that stem out, but where is the needle jet and how do I get to it?
tedwilley
02-22-2008, 04:25 PM
http://www.exriders.com/vbb/showthread.php?s=&threadid=313215

Full instructions near the bottom of page one
Honda10
02-23-2008, 05:27 AM
Yes I found it last night thank you, but I put a 120 main and did not mess with the e-clip because it was already at the 3rd slot and I did not mess with the fuel mixture screw. So when i went to rev it I slowly hit the gas and then wide open after the enging warmed and when I let off the gas it had loud back fire. Is this the main jet that is too big or do I have to mess with the Fuel/air mixture screw?
02-23-2008, 08:09 AM
bigger pilot. Pilot controls Idle - 1/4 throttle, and it controls the fuel on deceleration. Backfiring when letting off the throttle is caused by lean conditions. A bigger pilot should work and idk about the A/F screw.
Honda10
02-23-2008, 09:37 AM
Ok you alredy told me that, I am asking other people.
BlasterEaten250
02-23-2008, 07:31 PM
That seems like a really big main jet.
exrider12
02-23-2008, 07:36 PM
not trying to jack the thread but will a procom revbox affect my jetting?
Honda10
02-24-2008, 06:33 AM
i dont think so, because it is electrical
02-24-2008, 09:07 AM
Originally posted by exrider12
not trying to jack the thread but will a procom revbox affect my jetting?

CDI will not change your jetting. It only controls timing, ignition, and rev limiter really.
exrider12
02-24-2008, 12:57 PM
k thx
250excrf250r
02-24-2008, 07:01 PM
you have to big a main jet i run a 110 with eclip on 4th postition with wat is in my signature and it runs perfect or u could use the 112
ryanh250ex
02-25-2008, 09:01 AM
Jesus where to begin.... Okay the needle jet itself is directly under the main.Anytime you adjust the timing your jetting will be affected regardless of how its done.. Put the eclip one notch lower and then go ride it and see what happens.
Honda10
02-25-2008, 06:38 PM
ok i went out riding the other day and I had just installed my HMF,K&N, and no airbox lid. I put in a 115 main and fuel mixture screw 3 and a half turns out. I did not change the e or c clip. I noticed when I was riding that I didnt feel very much of a gain at all and it kept backfiring in 1st 2nd and a little in 3rd on deceal. Should I adjust the e clip or c clip, and should I lower my main?