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Aftermarket Engine/Parts
Lifan
New 125 Sputters through all throttle/idle
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<blockquote data-quote="69ST" data-source="post: 180299" data-attributes="member: 5"><p>That does, indeed, look to be a real Mikuni VM22-133 carb. No point in second-guessing my jetting suggestions, unless you've seen this carb/intake/air filter combo on another L125 that is exactly the same as yours. Even then, you could end up finding as much as a 2 main jet size difference between them. You've gotta begin somewhere, figure out whether the carb needs to be jetted richer, or leaner, than is possible with those suggested mains and proceed from there.</p><p></p><p>Jet needle height has a huge impact on performance, so my first suggestion would be to start with the c-clip in the middle groove. If the engine runs lean, reposition the c-clip to the bottom groove, too rich, the top groove, then retest. If the mixture is still too rich with the leanest setting (jet needle c-clip in the top groove) drop down one jet size and repeat the process. If it's too lean, repeat the process but go up one jet size.</p><p></p><p>FYI, the sealing washer on the float bowl will either be dead-soft aluminum, or dead-soft aluminum with a polymer gasket. Be very gentle when tightening the jet holder. That washer can be ruined very easily...just a slight bit of excessive tightening torque and it'll never seal again. With care, the washer will last nearly forever and survive many R&Rs.</p></blockquote><p></p>
[QUOTE="69ST, post: 180299, member: 5"] That does, indeed, look to be a real Mikuni VM22-133 carb. No point in second-guessing my jetting suggestions, unless you've seen this carb/intake/air filter combo on another L125 that is exactly the same as yours. Even then, you could end up finding as much as a 2 main jet size difference between them. You've gotta begin somewhere, figure out whether the carb needs to be jetted richer, or leaner, than is possible with those suggested mains and proceed from there. Jet needle height has a huge impact on performance, so my first suggestion would be to start with the c-clip in the middle groove. If the engine runs lean, reposition the c-clip to the bottom groove, too rich, the top groove, then retest. If the mixture is still too rich with the leanest setting (jet needle c-clip in the top groove) drop down one jet size and repeat the process. If it's too lean, repeat the process but go up one jet size. FYI, the sealing washer on the float bowl will either be dead-soft aluminum, or dead-soft aluminum with a polymer gasket. Be very gentle when tightening the jet holder. That washer can be ruined very easily...just a slight bit of excessive tightening torque and it'll never seal again. With care, the washer will last nearly forever and survive many R&Rs. [/QUOTE]
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Lifan
New 125 Sputters through all throttle/idle
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