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KTM MX & Off-Road Dirt Bikes
KTM 520 experiences
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[QUOTE="Hick, post: 17703, member: 19514"] The standard Keihin setting (according to Sudco) is .6mm. This affects when the pump starts pumping, (at .6mm this will be just after the slide opens), while your R&D cover shortened the pump stroke. If you’re curious the guys at Factory R&D can tell you the stroke length you ended up with. Stock should be about 3mm on the slant FCR. Some WR guys on Thumpertalk are going crazy with all kinds of accelerator pump modifications, including disconnecting the thing altogether. The R&D cover shortens it a fixed amount (differs for diff. models I’m told), but I’ve heard two really good ideas for adjusting the pump stroke on the slant FCR that are cheap and easy and allow different lengths (some guys are down to 1 mm and love the results): 1) Place shims under the pump diaphragm of different thickness, where the desired reduction in stroke is the shim thickness. 2) Drill and tap a hole in the bottom of the cover for a set screw. Turn in to shorten stroke, out to lengthen. Another invaluable FCR tuning tip is the use of an air screw in place of the fixed pilot air jet. Sudco carries these parts (screw and spring) for about twelve bucks. It seems an improvement can be had by shortening the pump stroke, going richer on pilot and needle and larger on the pilot air jet, but with the optional air screw you don’t have to swap the jet each time you want to change it and it is more adjustable. I think those guys have too much free time on their hands… At any rate JohnnyMac I think a larger pilot and pilot air jet may be worth trying (but check your pump timing first). [/QUOTE]
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Dirt Bike Discussions By Brand
KTM MX & Off-Road Dirt Bikes
KTM 520 experiences
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