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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Affect of cutting slide?
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[QUOTE="Chief, post: 272104, member: 24546"] whyz, My bike has the Keihin pwk carb. The choke knob has 6 clicks to 1 full turn. (360 degrees). Just quoting the manual. Baseline setting is 12 clicks (2 full turns) out from a full close. recommended settings are from full close to 12 clicks(2 full turns) out, w/24 clicks (4 turns out) max. The choke (bypasss knob) has a big effect on air/fuel mixture at throttle positions fully closed to 1/4 open, then drops sharply to no effect at 3/8 throttle. As the knob is turned out, the mixture becomes leaner, More air is allowed to enter the mixture as the choke needle is raised. This adjustment only affects the choke needle when the knob is pushed into the down (already warmed up) position. It has little or no effect when the knob is pulled up. When my bike sputters at low throttle openings, it tends to knock. I have had good results adjusting the bypass knob to reduce the sputter and knock. It seems ironic that pulling the knob up richens the mixture, yet raising the needle on the same assembly leans it out. There is a collar on the needle assembly that I am guessing works by letting more fuel in when the knob is pulled up. Joe Chief [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Affect of cutting slide?
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