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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
81 kdx175 no powerband!
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[QUOTE="uts, post: 823755, member: 49992"] I'd say it does have a power valve. If you look at the cylinder, at the front near the top where the exhaust comes out(looking from the side of the bike) there should be a little cover that is bolted on to the cylinder. It will be roundish or oblong in shape. Kinda hard to describe. Anyway this is where the power valve is. It restricts the height of the exhaust port at low revs and opens at higher revs to make the exhaust port bigger. It is meant to broaden the power range. If this gets stuck closed your higher rev power will die. You will need a manual to pull this apart and clean it. Keep in mind it could be any of the other problems that the guys have listed to but I suspect a gooed up power valve. The spoog is another indicator cause spooge is what chocks up power valves. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
81 kdx175 no powerband!
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