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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Destroyed Piston 1993 YZ250. Pics.
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[QUOTE="pintilie503, post: 1399555, member: 72110"] Hey Guys. I just rebuilt my top end on my 1993 yz. I did a very meticulous job cleaning every nut bult, cylinder etc. After the rebuild I let my bike idle, warm up, and then cool down. I did this several times and then took my bike riding. After ten minutes into my ride the bike bogged and locked up. Upon removal of the Cylinder Head I found a eaten up piston and heavily gouged cylinder wall. I was running 32:1, had standard factory jets in there, and set the needle to the richest setting. I found what appears to be itty bitty fragements of my air filter in the reed assembly. Could that be the culprit of this. Also, where do I go from here. This is my first bike and I need some advice. Is it worth replating the cylinder, putting in a new rod and bearings, and putting in a new piston. Not including the other things Ill need such as air filter, gasket kits, etc. I kind of like the idea that its an older bike and that you can find cheaper parts for it. It was also running great just before the rebuild, but after inspecting the oem piston i found a cracked skirt and then proceeded to do the top end. Thanks for your input. Also any recommendations on where to send out the cylinder and some good parts websites would be greatly appreciated. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Destroyed Piston 1993 YZ250. Pics.
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