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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Drilling holes in the piston?
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[QUOTE="EricGorr, post: 213731, member: 19611"] The excessive wear on the bridge was probably not wear but an attempt to dish the bridge. Thats a common task performed after boring and honing a cylinder. The proper spec is only .004 inch more than the bore size. The Wiseco pistons are turned for a specific shape that enables them to become round when at operating temperature. Its not totally neccessary to drill the holes if the bridge is relieved correctly, but its a good safety margin. Regarding the meltdown, its not likely from the bridge work, its probably related to jetting and load. That engine doesn't like to rev, but if its pushed hard jetting has to be compensated (bigger main jet). Good luck [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Drilling holes in the piston?
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