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Yamaha MX & Off-Road Dirt Bikes
Help please, burning piston after piston?
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[QUOTE="RobbyB, post: 1370770, member: 110302"] I've been up and running for a couple of weeks now with no problems. Here were the problems. - Timing was a slight bit advanced. I turned this back to stock. - Main jet was stock so I went up two sizes for the temp and for sand riding. This works well. I went from 420 to 440. I adjusted the needle one notch richer as well. - Head was planed at some point, I corrected this somewhat with a thicker base gasket. - I didn't do anything to find the source for the damage to the piston due to the foreign object. I rinsed the bottom end out several times into white cloth over a pail. There was abolutely nothing that came out. So I didn't bother with pulling the case apart. - The piston was salvagable so I re-used it. However, I don't like the Namura piston, to loose a fit. Next one will be the Weisco or Yamaha, they seem to have a much better fit. Thanks for all your assistance with these problems. We're going to upgrade to the yz250 next season. My son is to heavy for the 125, especially in the sand. The yz125 is an impressive performance machine I must say. [/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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