Jetting Help

[bansheeboy02]

I am running 35 pwks on a level 2 ported motor with cpi inframes. the motor runs great acept when I drag. WOT 1st 2nd and some of 3rd runs great then I get a little sputtering 4th same 5th same and then at the top of 5th it clears up and 6th is fine. Has anyone experienced this before? I am about sea level running 93 gas wit 20cc domes. Any clues would be great.

[locogato11283]

what main jet and pilot are you currently running?

[bansheeboy02]

what main jet and pilot are you currently running?

 

There are 160 mains and 68 pilots. when running the quad just using bottom end and checking the plugs, they are dark brown. when running WOT for a few seconds and the killing the ignition and checking the plugs they look about the same. I figured out today that when I drag, if I am wide open when this bogg comes in, I let off to half throttle and it getts a lot better but have to play with the throttle until it hits 5th top end, then I can hold it wide open and it runs good. I have no clue where to start. I never experienced this before.

[locogato11283]

how does it start? no choke? 68 pilot is pretty much unheard of in those carbs. most pwk carbs run about a 42 to 48 pilot. as for the main jet, 160 is pretty much what i run in all my pwk carbs on a couple different motors. but, if your plugs are dark brown youre too rich. drop down to a 155 or 158 main jet and ill bet that itll clear up the bogging in the top end.

[bansheeboy02]

how does it start? no choke? 68 pilot is pretty much unheard of in those carbs. most pwk carbs run about a 42 to 48 pilot. as for the main jet, 160 is pretty much what i run in all my pwk carbs on a couple different motors. but, if your plugs are dark brown youre too rich. drop down to a 155 or 158 main jet and ill bet that itll clear up the bogging in the top end.

 

When left a few days, one kick without choke (30 to 40 degrees) starts right up. It won't take the gas good for a few seconds which is understandable. If I choke it, it still starts in one kick but obviously takes the gas better till it warms up. They come with 68 from the factory. I havnt changed anything because I wanted to get a direction to go in. When do my pilots stop working and let the mains take over? Do you think I should go right down to a 48 or somewhere in the middle of 48 to 68? Thank you for your help, now I just have to find a place that will have the mains I need in stock.