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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="whenfoxforks-ruled, post: 1364924, member: 73147"] Is there a score mark running down the exhaust side of the piston? Has the top of the piston ever been missing pieces or have melted looking spots, on the exhaust side? If the manual said 20 to 24 thousandths ring end gap, and you had it at 18? Its too tight, snap/seize. Check the ports for chamfered edges, .002 skirt clearance, .0035 at least on the exhaust bridge clearance, and set the end gap to what the book says. Burnt spot on the bottom of the piston? If the spark plug has shiny drop lets, knocking or the plug is coming loose, you need higher octane fuel. When you go riding in the sand, richen the main. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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