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what would cause a 02yz250 to be hard to start just rebuilt it and its hard to start but cranks easy but was doing the same thing bein told needs shim

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what would cause a 02yz250 to be hard to start just rebuilt it and its hard to start but cranks easy but was doing the same thing bein told needs shimed

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thank it needs shimed runs to good to be out of time. need specs for the valves

.10-.15mm intake

.17-.21mm? Exhaust

I might be wrong on the exhaust side I'm going from memory here

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