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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="Katoum, post: 476199, member: 21069"] Problem solved! No more 4 turns out on idle screw. Thanks to JC Soto and Mike at Cycle Zone the elusive idle fuel screw problem has been solved. Page 23 Part 21 Gasket Plate Throttle Valve was installed upside down. Check orientation in manual and you will see the a there is a small hole in plate which has to be as in picture, which is hole to bottom of carb. Mine was upside down, causing the idle circuit to run extremely lean regardless of jetting changes. It incredible that this part goes together either way and one can see how a factory worker could have made the mistake in assembly. It's also easy to see how we all missed problem on inspection of carb. So if anyone out there has modified their 03 RFS's to make them idle by richening pilot circuit to correct lean idle please check by looking in bore from the rear of carb, and there should be a 1/4 hold in plate near bottom of plate, if you see half a hole in plate at very top of bore then yours to is upside down. After correcting we turned idle speed wheel right back and turned fuel screw to 1 turn out and bike fired up immediately and purred like it should. funny how the simple things are the ones that go undetected for the longest. [/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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