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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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[QUOTE="JC Soto, post: 450144, member: 35291"] Bonehead, I think Endoquest might be onto something about the throttle position sensor. I am currently on my 4th carburetor disassembly! This time I am bringing all the parts to work and cleanning it on a clean bench and checking the jet holes with a boroscope. I tested the bike this weekend on dirt and asphalt to characterize its behavior. I ran my bike with the 55 pilot jet (PJ), DVP #3, 170 main jet (MJ), stock exhaust, 1 turn on the slow air screw, and stock main air jet. From 0 to 1/8 throttle, the bike felt fuel starved. It hesitated and misfired. When accelerated from 0 to 1/3 the bike accelerated predictably. It probably can be leaned out a bit through this range. From mid to WOT the bike is snappy and responsive. Eventhough I am using a 55 PJ, the bike is hesitating at 1/8 throttle and the RPM's tend to increase when the bike gets hot. This makes me believe that there is not enough fuel going through the slow/idling circuit in the carb, why? I did re-check the vent holes and I am positive that they are open. I also measured the float level at work using a comparator and they are set at 8.6mm. I will report the results of my next reassembly and setup. JC [/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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