2002 Raptor 660 Stumbles @ open Throttle - 175/180 MAINS 25 Pilots

[pcataldo]

REJETTED WITH CT RACING NEEDLES 25 PILOTS AND 175/180 MAIN JETS Closed Airbox with Holes in Lid K&N filter - Big Gun Exhaust, Stock Head Pipes wrapped with exhaust wrap. Rev Box.

My Elevation is zero - Question are my main jets to large or do I need to get rid of Exhaust box with Proflow Intake??

[Peelz]

Seems kinda big to me. I don't know with the needles being changed though.

Your setup is very close to mine, And, I am at 150/155. Stock pilot. Moved needle up a clip. That is a big diference. And Iowa is not that high of altitude.  I think it is time for a plug check.

[Flynbyu]

Your jets are WAY too big for your mods.

With a closed airbox, you should be at 155/160 tops.

With the lid removed, 160/165 tops.

Now if you ever change the piston, and throw a new cam in, 175/180 would be alright with a high flow lid.

~Brian

[iluvdirt]

I run 155 and 160 with an open air box.  Yours are definetly too big.

[1FST690]

155-160 all the way. Take the airbox lid off and see if it runs better. What kind of fuel are you running?

[Bocephus]

at 1500ft asl with full exhaust and open airbox, i was running 160/165 with 25 pilot.  right now with my built engine im at 175/180.  so, you are definitely too rich.