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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="cbm4stroke, post: 469676, member: 17506"] If you could get by without a pump and only run on the carburetor metering circuits it would be best. However, to get excellent off idle response the pump is used as a gap filler to transition from idle to the needle circuits on rapid throttle openings. Unfortunately the pump blasts a basically uncontrolled shot of raw fuel into the intake. Since the pump operates during all throttle movements not just the rapid ones and it is not a very well metered shot you want the pump squirt to be as short as possible to bridge the gap between the METERED carburetor circuits. This helps prevent the engine from loading up, conserves fuel and will improve engine response. With the second generation Kehin FCR you have a adjustment screw to control the pump start point and with the BK mod a second screw is added to control the stop point--giving complete and easy adjustment to the pump "Squirt" start and duration. Consensus says about 1 second of squirt starting as soon as the throttle slide moves is a good start point. Depending on your pilot circuit and needle selection you should experiment from there to get a optimum performance for your situation (location, altitude, needle, PJ, PAJ or setting of the Adjustable Pilot Air Jet (APJ) if used, etc.). Cheers Clark [/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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