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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
Jetting what base to use
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[QUOTE="2-Strokes 4-ever, post: 1413324, member: 58946"] New puppy here, not much sleep (thanks Okie for the Dog Crate Sponsor) so... Establish the original, stock jetting specs. Make sure bike is always fully warm before checking jetting. We've been doing this long enough that we just do pilot and needle by sound, feel, and responce, main by plug-check. Pilot first- Your airscrew should always be in the adjustment range from 1-2&1/2 turns out from fully seated. Establish an idle and turn airscrew to establish highest idle, then we go back in 1/4 turn. If you find this "zone" within the above range, then you're good. If not, going IN further means you need a richer pilot, and OUT further... a leaner one. If different pilot is needed, repeat procedure until correct pilot is found. The pilot is important, although it's main effect is in the first 1/4 throttle usage, it does effect the entire throttle range even though less and less the more you twist. Needle next- Ride bike under a load at aprox 1/2 throttle. If a blubber is heard, go leaner on clip (raise clip position), if you sense a knock or pinging, move clip down to richen. Main jet- Ride bike under a load at wide open for a few seconds. Pull in clutch, chop throttle, and hit kill button all at once. Check plug for color, what you want is a flesh color plug. Darker means you're rich, whitish means you're lean. We always establish the ideal color and then I go one size richer to ensure safe running if we encounter hard running in sand or mud. After establishing the main jet it's a good idea to go back and check the needle in the midrange again. Because I ride when it's 20*F - 90*F, I keep a chalk board in the shop to tell me my required jetting specs based on the season (temps) of the year. We change jetting three times a year depending on temps. Hope this helps, now I must take our new dog out before he poops on the carpet... :whoa: [/QUOTE]
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Dirt Bike Discussions By Brand
Kawasaki MX & Off-Road Dirt Bikes
Jetting what base to use
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