My friend has a yoshi pipe on his raptor, and cant get it to run right.
K&N filter, no lid, Dynojet needles.
What does everyone have for jets, air screw and needle settings?
when he hits the gas and lets off it revs at about 1/8 to 1/4 throttle and then slows down after a couple of secs. It also doesnt want to idle good.

 

go to one of your local shops and put it on a dyno and have them tune it.

 

148/150 mains
Clips on 3rd groove
Idle screws out 2 3/4 L, 3 R .The idle is lean, that's why it's acting up.
VERY IMPORTANT!!! Adjust the float level ( tube method ). There's a thread on this page or the next explaining how to do it.
Adjust the valves also while your in the area, makes a big difference in how it runs and is a must when trying to tune your carbs.

 

BLASTER DEVIL SAID IT.