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Yamaha MX & Off-Road Dirt Bikes
03 yz250f rebuild
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[QUOTE="Rich Rohrich, post: 1459644, member: 16241"] Given the state you found it in, you should pull the valves and check them for wear along with inspecting the valve seats. You'll also want to replace all the valve springs. They are only good for a season or so of regular riding. Luckily they are really cheap. You can reuse shims, but chances are good you will need different sizes then what is currently in the engine. Investing in a Hot Cams shim kit is money well spent if you are going to own a four-stroke. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
03 yz250f rebuild
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