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Kawasaki MX & Off-Road Dirt Bikes
KX125 97 fRIGGIN JUNK! ergg...need help
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[QUOTE="Colorado, post: 990957, member: 60368"] Just checking. I bought a used KDX175 that idled okay, ran okay on the pipe at high rpm, but simply bogged in the midrange, and particularly at the transition to 3/4 throttle power. It made aproaches to jumps and coming out of turns eratic, and even a little scary at jumps because I might come down with my rear wheel over my shoulders if I missed the powerband. A couple of people suggested that the powerband might just be all high like that, but I knew that it couldn't be THAT high. My plugs were usually pretty well colored, but would sometimes show just a little fouling. I played with the needle position, but could get only minor improvement. I went out and bought main jets in increments of 5 from 130 to 145 (it came with a 150) and finally got it (almost) right with a 135 main and the needle position in the middle. After that I read the manual and found out that the stock main is 138 (I'm at high alltitude, so leaning down is usually in order). I have NO idea why the last owner had a 150 in it! When I leaned down to 130 my midrange improved, but my top end tapered away. Usually cutting out in the midrange is a sign of a rich mixture. I don't remember what jets your earlier post said you tried, or what the stock KX jets are, but pilot jets mainly effect idle. I would go back to the one it came with if idle was okay. I do remember that you said you changed your pre-mix to 40:1, but you didn't say from what. If you began at 50:1, that made your mix leaner. More oil means less air. If you began at 32:1, you made your mix richer --- which might be more of just what is creating your problem. I would try jetting leaner in the main and dropping the needle one groove from the bottom. [/QUOTE]
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Kawasaki MX & Off-Road Dirt Bikes
KX125 97 fRIGGIN JUNK! ergg...need help
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