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Everything Dirt Bike
Make / Model Specific
Kawasaki
Jetting Question
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<blockquote data-quote="ozzyvanhalenrox" data-source="post: 208961" data-attributes="member: 535"><p>I ended up getting it all back together last Wednesday and took it riding over the weekend. The bike runs great now, but i think it may be running a bit lean. I went with a 165 main instead of the 160 it had in it. Didn't have any problems with fouling plugs, but when ran hard it would sort of surge up and down in rpms at idle. Not sure if that means it is running a little lean or what. The bike use to do this sometimes when I would rde it up a sand hill wide open, but it seems to be doing it more often now. air/fuel screw is 1.5 turns out. Before the rebuild it was 2.5 turns out. 32-1 mixture with yamalube racing oil. The "porting job" was only to clean up the ports a bit. Did not change the size of any of them. The cylinder has a steel sleeve and I bored it slightly because the people doing the work to the head said it was time. Thinking of either putting in a slightly bigger pilot jet or messing with the air screw, but I want to be careful. My buddy with the same bike fouled 2 plugs on the same rides, not sure about his jetting but he has a custom made pro circuit pipe because his bike is a 2015 kx250f frame with a 2003 kx250 engine in it so they had to custom make the pipe for it.</p></blockquote><p></p>
[QUOTE="ozzyvanhalenrox, post: 208961, member: 535"] I ended up getting it all back together last Wednesday and took it riding over the weekend. The bike runs great now, but i think it may be running a bit lean. I went with a 165 main instead of the 160 it had in it. Didn't have any problems with fouling plugs, but when ran hard it would sort of surge up and down in rpms at idle. Not sure if that means it is running a little lean or what. The bike use to do this sometimes when I would rde it up a sand hill wide open, but it seems to be doing it more often now. air/fuel screw is 1.5 turns out. Before the rebuild it was 2.5 turns out. 32-1 mixture with yamalube racing oil. The "porting job" was only to clean up the ports a bit. Did not change the size of any of them. The cylinder has a steel sleeve and I bored it slightly because the people doing the work to the head said it was time. Thinking of either putting in a slightly bigger pilot jet or messing with the air screw, but I want to be careful. My buddy with the same bike fouled 2 plugs on the same rides, not sure about his jetting but he has a custom made pro circuit pipe because his bike is a 2015 kx250f frame with a 2003 kx250 engine in it so they had to custom make the pipe for it. [/QUOTE]
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Jetting Question
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