Im running a 155 main, and at WOT the plug turns white. The needle is on the very top clip (super lean) but its still so rich it fouls plugs. What should I do?

 

i thought if its white that means its too lean and black was rich to foul plugs. I dont know much about jettin but i think you need to go richer. dont take my word for it tho, im just learning

 

I think its true that if you have a rich running engine you should have a black sooty plug. White would seem to me to indicate a lean mixture as well, but im no professional. I hope someone else with experience can help.

 

yeah leans white and rich is black.

 

You NEED to go richer BEFORE YOU DRIVE IT AGAIN, or you risk melting the piston.

Try a hotter plug.

 

What I mean is the mid range is rich and the top end is lean. I figured it out though. Too much cam overlap + not enough back pressure was messing me up. I put a piece of aluminum tape over the end of the pipe and it ran right till it tore in half.

 

Jakalwarrior has the clip on the most top notch on the needle. WAYYY to lean. I even saw the plug.

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yeah yeah, you saw it after I ran around on full throttle. You didnt see the 3 I turned black testing mid range.

 

I am not real familiar with the Warrior carb, but I would suggest checking your float level. If the float level is too low, it can run rich in the midrange but then on the top end, no matter how big of jet you use, there is not enough gas to feed it. I will bet that if you raise your float level a little bit it will fix the lean problem on top. Then you can work on the rich mid-range.

RR1