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Yamaha MX & Off-Road Dirt Bikes
YZ80 overheating and no powerband
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[QUOTE="bikepilot, post: 879411, member: 56976"] Do a compression test and report back please. Also a leak down test would be good. How are you determining that it is over-heating? If you fill the rad all the way up it should spew a little coolant out when the bike warms up to a normal temp (coolant expands when it gets warm, and unlike your car your YZ has no resivor to catch the fluid that is pushed out.) If the bike is pushing a lot of coolant out very shortly after starting it is highly unlikly that it is actually overheating, but is probably the result of a bad head gasket or warped head. A compression test will help spot this. Also, with a cold eninge you could start the bike with the rad cap off and watch for bubles. When you say you replaced the gaskets, which did you replace and did you lap the mating surfaces first? good luck [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
YZ80 overheating and no powerband
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