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Yamaha MX & Off-Road Dirt Bikes
noob 2 stroke questions
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[QUOTE="sharky243, post: 1325470, member: 100273"] Barnett makes a good aftermarket clutch, but in your case just trail riding, OEM works fine as well. The power valve controlls the exhaust flow. It opens at lower RPM's and redirects some of the exhaust gases through "surge ports" which gives the effect of a long header pipe. This boosts the low-mid range torque. 125cc's don't have much there anyway. At higher RPM's, the valve closes off the "surge ports" and opens the exhaust port fully which boosts top end power. The power valve has a great effect on the power band, when and how hard it hits. There's not much for maintainance other then cleaning it, making sure it moves freely, and inspecting it for wear whenever the top end is apart. Oven cleaner works good to clean the carbon and sludge from the power valve components. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
noob 2 stroke questions
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