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02` yz250f jetting

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when reading the spark plug should i check it after its been idling or should i ride at half throttle and hit the kill switch then check the plug. also i have an assortment of jets and needles from when i raced honda 250r will those work in the new keihen carb or should i just order a kit. this is my first 4stroke. thanks ahead a time.

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bike runs alright theres abit of a bog at about quarter throttle and its hard to start even with the hot start pulled out.

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