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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Air Striker Carb
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[QUOTE="Lizard Lips, post: 677650, member: 47677"] The KDX 220 comes from the factory with a 33mm carb to add to low speed velocity (torque). The reason I went with RB conversion on mine is because (and correct me if I'm wrong here) by boring it to 36mm and installing the divider plate you new effectivley have a variable geometry veturi. The plate runs all the way to the slide and contours around it. The upper half of the throat is blocked off up to half throttle. This gives you a 28mm carb up to half throttle becuase the slide blocks the upper half up to that point. The pilot jet size drops because of the increase in velocity. So with the Mod you get a gain in efficiency over the stock 33mm PWK for lowspeed torque and a gain in high end as well when you open it up beyond the divder plate and use all 36mm. Best of both worlds the way I see it. [/QUOTE]
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Dirt Bike Discussions By Brand
Canadian Daves JustKDX
Air Striker Carb
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