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General Minitrail Talk
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tuning challenge - off throttle issues
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<blockquote data-quote="fatcaaat" data-source="post: 171700" data-attributes="member: 1656"><p>Ok, here's some results from today's tuning.</p><p></p><p>Baseline jetting = 20/180 on the mikuni vm26, needle one clip lean from center. In this position, it idles and runs out top to bottom clean all the way. It starts easy. However, this is the off throttle that will make it die. Changing the a/f mixture screw impacts the idle speed and how well it idles, but won't clean up the off throttle stumble. Idles best at 1.75 turns out. </p><p></p><p>17.5/180. Hard to start, didn't notice any change in the off idle issue. Idles a little loopy. </p><p>22.5/180. Easy to start, removes the off throttle issues. Creates new idle issue that is rough and stinky. Bike now stalls at idle and getting the idle adjust screw is really finicky.</p><p></p><p>I'm drawing my conclusions...that the idle and main jets are probably right at 20/180. I guess the next thing to do is start looking at needle tapers. I have about 6 different needles here so really I just need one that is a little thinner for the off idle and that might clean it up so it richens right there.</p></blockquote><p></p>
[QUOTE="fatcaaat, post: 171700, member: 1656"] Ok, here's some results from today's tuning. Baseline jetting = 20/180 on the mikuni vm26, needle one clip lean from center. In this position, it idles and runs out top to bottom clean all the way. It starts easy. However, this is the off throttle that will make it die. Changing the a/f mixture screw impacts the idle speed and how well it idles, but won't clean up the off throttle stumble. Idles best at 1.75 turns out. 17.5/180. Hard to start, didn't notice any change in the off idle issue. Idles a little loopy. 22.5/180. Easy to start, removes the off throttle issues. Creates new idle issue that is rough and stinky. Bike now stalls at idle and getting the idle adjust screw is really finicky. I'm drawing my conclusions...that the idle and main jets are probably right at 20/180. I guess the next thing to do is start looking at needle tapers. I have about 6 different needles here so really I just need one that is a little thinner for the off idle and that might clean it up so it richens right there. [/QUOTE]
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tuning challenge - off throttle issues
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