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Rm250 power valve wont open .

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Hey guys i pulled the valve .cleaned it very good . Nothing seems wrong the valves open smooth when i turn them by hand . The only way the valve will open is if i take all preload and even than it only opens halfway . If the bike is in neutral and i rev it the valve will open all the way ... But it wont open all the way under load . With the tension adjusted to factory spec the valve wont open at all ... , i just pulled the governor off and it seems smooth and in good working order im lost any helpful input is appreciated .

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