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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
cr125 piston
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[QUOTE="Robin13, post: 873485, member: 57149"] Those are there to lubricate and cool the exhaust bridge. The bridge expands faster when the engine heats up than the rest of the cilinder because of its relatively small size and large surface area. So to cool it and lubricate it, the piston is drilled. My wiseco came pre drilled, and with instructions in case it wasn't. Wash your bike weel before rebuilding your topend so no dirt will fall into the cases/cilinder. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
cr125 piston
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