high RPM stumble with HMF slip on and new jets

[Jake250ex]

Hey, just installed a HMF sport slip on and a 165 main jet and a 48 pilot on my 07 ER. IT starts and runs good until high RPMs where it feels like it "skips" or stumbles. Any suggestions? Is this common?

Maybe your hitting the rev limiter.

[TRX450RACER174]

What about the needle?

[Jake250ex]

stock needle

[ryanowarrior]

what about the air flow?? do any changes to that part??

[Jake250ex]

nope stock airbox and filter

[GPracer2500]

165 might be too rich with the airbox lid on. A way too rich main jet can behave almost like a rev limiter that comes on too early. Pop the airbox lid off and see if the stumble dissapears. If it does then you'll know to keep stepping down on the main if you want to run the lid.

[Jake250ex]

k thanks ill try.

what do you guys think about me doing a detailed how to jet article on here?

i mean, if you know the size you need what all you gotta do

[Jake250ex]

runs like a raped ape now! thanks

[ryanowarrior]

glad to hear ya got it running good!!! dang jetting sucks dont it!!! i have the same problems when i do that!!!

[StuntCockRacing]

What size jet did you end up using?

Make sure you double check your plug after re-jetting