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Honda MX & Off-Road Dirt Bikes
05 CRF250R Engine wear
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[QUOTE="Cabot, post: 1272638, member: 79941"] I just bought an 05 CRF250R a couple months ago, but it was too cold to do anything with it yet. According to the previous owner, it had little hours on it, but you know how those used bike sales go. :blah: I decided to tear into the engine and see what I had. Intake valves were off, not by much. I have to go one size down from 1.92mm. no problem. they passed all other tests (although I did not take the valves out of the head) There were a couple of things that I was unsure about, and I couldn't find the answer in the manual. 1)The piston was worn on the skirts on both intake and exhaust side. [IMG]http://i38.photobucket.com/albums/e133/bkinwi/IMG_2875.jpg[/IMG] ^intake side [IMG]http://i38.photobucket.com/albums/e133/bkinwi/IMG_2874.jpg[/IMG] ^exhaust side You can see in this picture you can see the black carbon (or whatever it is) is not only on the top of the piston, but extends down the side of the piston untill the top ring on the exhaust side. I am going to replace the piston, but was just wondering if this was hinting towards another problem the engine may have. 2) The cylender had very slight wear on the bore. [IMG]http://i38.photobucket.com/albums/e133/bkinwi/IMG_2877.jpg[/IMG] [IMG]http://i38.photobucket.com/albums/e133/bkinwi/IMG_2876.jpg[/IMG] You can just see it in the pictures. I am going to get the cylender rehoned but, once again, I was wondering if this is anything I should worry about. [/QUOTE]
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Dirt Bike Discussions By Brand
Honda MX & Off-Road Dirt Bikes
05 CRF250R Engine wear
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