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Honda MX & Off-Road Dirt Bikes
Cr250 piston wear
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[QUOTE="whenfoxforks-ruled, post: 1225341, member: 73147"] If the oem did not come with holes,I would shy away from drilling. More important is to take your new oem piston and a feeler gauge and measure your cylinder to skirt clearance in different areas,at right angles. Check it where the piston normally rides. Especially at the exhaust bridge. I would think between 3.5 and 4 thousandths,2 on the cylinder walls. When checking the bridge moving the piston up higher than normal is not safe if you have a ridge on the top. Do not force it. I have seen guys take pistons in and out the top,makes me nervous! [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
Cr250 piston wear
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