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KTM MX & Off-Road Dirt Bikes
525 and maybe the 450's jetting problems
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[QUOTE="drehwurm, post: 452886, member: 20888"] Servus, Lets try it a different way - maybe this checklist can offer a little help in pinpointing the problem. A 55 pilot or 3 1/2 turns on the pilot screw is a clear sign for a problem - no matter how you put it! It seems obvious that we have a lean situation mostly affecting the pilot circuit here. Lean means too little fuel or too much air. Too little fuel: 1) clogged pilot circuit: as the problem seems to affect more people, there may be a problem from production on some carbs! 2) as needles and pilot jets have been changed to no avail , only the [B]needle jet[/B] (aka main nozzle or emulsion tube) could be the culprit. If too small (due to whatever reason) symptoms are the same like a wrong (too big aka lean) needle root diameter, which can cause exactely the problems described here. Too much air: 3) maybe not a carb problem at all! Did anyone switch carbs to verify? 4) air leak: carb boot, carb housing, choke circuit, ... 5) pilot air jet: has not been mentioned so far. The PAJ is located beneath the intake bell just beside the main air jet. If not the corret size (should be a 100) or maybe missing at all (!!!) symptoms are like described. Michael [/QUOTE]
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Dirt Bike Discussions By Brand
KTM MX & Off-Road Dirt Bikes
525 and maybe the 450's jetting problems
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