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Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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[QUOTE="Rich Rohrich, post: 1372750, member: 16241"] Well, the seat contact area is where the majority of the heat transfer takes place between the hot exhaust valve and the relatively cool (by comparison) cylinder head. If the exhaust valves are running at substantially different temperatures, then it stands to reason they would react to what's happening in the combustion chamber differently. It's similar to the way different heat range spark plugs color differently. If oil is entering the chamber, and on a worn 250F it definitely is, then the effect will tend to be more pronounced in the same way a two-stroke shows more color on the plug from the oil. As for the cam cap, it looks to me like the bearing is spinning. When the valve springs are worn those cams whip around like crazy, so there is no telling what type of motion is being transferred along the shaft to the bearing end. I've seen lots of 250 Hondas with similar markings. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Some cylinder head questions (with pics)
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