QuadMatt
07-24-2002, 07:07 AM
I am looking for some guidance in jetting. Here is my situation:
2000 400EX
K&N Filter
K&N Jet kit
Stock exhaust with the center of the tip cut out so its like a big hole with no spark arrester or anything.
When i put the K&N filter on i put the K&N needle and the 142 jet in. Then i cut the muffler and i moved the needle down one notch to fourth from top. There is a good performance increase. Better throttle response and low end. Im happy with the performance, but im running rich. My plug gets black and i get black smoke when revving high. So, I have the thing apart and i am wondering what to do. Should I put the needle back to third from top and go with the next size jet? I cant remember what was the next size up.
ALso, I assume from looking at the jets that the K&N jets are a completely different system than stock regarding the sizes. What i mean is that the same number stock jet is not equivalent to the same number K&N jet. Is this true?
Does anyone know of a source for a chart that tells you how jets effect your air/fuel mixture? This would be for the K&N jet kit.
Any help here is appreciated. Thanks
2000 400EX
K&N Filter
K&N Jet kit
Stock exhaust with the center of the tip cut out so its like a big hole with no spark arrester or anything.
When i put the K&N filter on i put the K&N needle and the 142 jet in. Then i cut the muffler and i moved the needle down one notch to fourth from top. There is a good performance increase. Better throttle response and low end. Im happy with the performance, but im running rich. My plug gets black and i get black smoke when revving high. So, I have the thing apart and i am wondering what to do. Should I put the needle back to third from top and go with the next size jet? I cant remember what was the next size up.
ALso, I assume from looking at the jets that the K&N jets are a completely different system than stock regarding the sizes. What i mean is that the same number stock jet is not equivalent to the same number K&N jet. Is this true?
Does anyone know of a source for a chart that tells you how jets effect your air/fuel mixture? This would be for the K&N jet kit.
Any help here is appreciated. Thanks