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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Acc. Pump Tuning?
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[QUOTE="Hick, post: 713935, member: 19514"] I don't own a 250f and have only ridden one, but I do know that leaner leak jets for the AP are a popular mod over at Thumpertalk. Also, if the bog is instantaneous it is probably more on the pilot/idle/pump than the clip. If you are lean on the clip you will get what I would describe as a hiccup, the bike falls flat when you come on the taper (probably about 1/3 throttle or thereabouts). As for determining rich vs. lean on pilot, I like to find a smooth road, and pull the tallest gear you can at a low throttle setting, like 1/4. If the bike surges you are lean, if it sputters you are rich. Also, a lean pilot circuit will produce more popping on decel (all else being equal) vs. a rich condition... Hope this helps. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Acc. Pump Tuning?
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