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slight "poppin" near topped out
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Posted by: rescuescrub

hey all. well got all my stuff in and on the atv. seems like there is a slight "poppinig" when topped out. no poppin when decellerating. great off the line and mid. adjustment of the air/fuel screw should fix this, right? got a k/n fitler w/ outercover, hmf full system, dynojet 110, air box lid on. want to thank all of you that have responded to my threads. this is an awesome site for info. thnxs in advance...... ps in i live iin south fla...

'07 TRX250EX
K/N FILTER
DYNOJET 110
HMF FULL SYSTEM
RAZRS ALL AROUND
A/C NERFS/SKID PLATE

Posted by: BR16250

if it isnt warmed up that is normal. otherwise id rejet to a 108 main thats what i run its perfect

Posted by: rescuescrub

so its too rich...not too lean at the top end huh. and adjusting the air fuel mixture screw wont help at all. seems it only needs a slight adjustment. or is that screw for idle only? fugured it was not getting enough fuel and might have to go to 112 dynojert...huh im confused

Posted by: 250excrf250r

try takeing the air box lid off see if that does anything because if its too rich i should go back to normal without rejetting.

now that may not help but its worth a shot

Posted by: rescuescrub

i c. guess ill take the lid off and c what the difference is. thats a quick way to see which way i need to go. thought it might b starvin for fuel at the top end though, which would mean i need a 112 jet....and back to that dam screw. adjusting that would help or like i asked its only for adjustment at idle?...

Posted by: 450rJam

too fat and the top end will have a false rev limit

like it wont rap the last 25% of the gear

check your plug

Posted by: ryanh250ex

you either have pinging (octane related, or bad gas) or it is lean, as far as i can tell. I cant help you with jetting because you're using dynojets.