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1990 yz 250 power is intermittent

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Power is good mid range I hit power band and then chokes out.. Bottom end is boggy too any help would be great! I have changed needle clip position and made no difference. New power valve. Plug is a little rich... All jets are Factory sizes...

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I'm still hitting power band... It just lasts only a second or so then Boggs out after 3/4 throttle

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