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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1978 Yamaha DT175
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[QUOTE="lub997, post: 1107727, member: 72793"] Do you have rust in your gas tank? Rust will cause a bike to run fine and then all of a sudden cut out like that. When you first fill your tank, the gas is clean and the bike runs great, but once it sits in the tank a while it absorbs the rust from the sides of the tank and turns from gas into rust water, and often there is very little sign of this when you clean the carb because the rust will be absorbed so well into the gasoline that there are no large flakes. It will even go right through a filter in your gas line. The best way to check for this is to remove the gas line at the point where it slips onto the carburetor and let some fuel drain out and see if it's clear as it should be or if it's brown with rust. Also, a plug from a good running engine should be more of a light tan than a chocolate. Spark plug oil fouling will also cause the symptoms you described, but if your plug is brown, I don't think that is your problem, because it was you would have black gooey spark plugs. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1978 Yamaha DT175
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