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00 kx 250 scratches on intake side of piston lines on the intake bridge of cylinder
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[QUOTE="flyinfish, post: 798928, member: 22919"] [b]50:1 Maybe your on to something![/b] I've run it at 50:1 with Redline for 95% of its life. Maybe your on to something with the ratio. I've noticed on the cylinder the marks are not noticable to the touch and you can still see the original hone pattern over the top of them. Therefore I don't buy the dirt or plate flaking theories, no offense guys. It just doesn't appear to be a mechanical breakdown situation. If it were I would expect more wear on the cylinder. My hone pattern was so good I just deglazed the cylinder with a scotch brite and threw it back together confident that the rings would have no trouble seating and there would be plenty of surface area for the oil to cling to. It seems like hot spots are occuring between the piston and cylinder at the intake bridges. Since the piston is softer than the cylinder it begins to breakdown first because of the extreme localized temperatures associated with the hot spots. the marks on the cylinder appear to be discoloration in the metal from uneven heating. (Perhaps from insufficient lubrication). I do believe that if I ran that piston another 80 hours then the hot spots may have eventually caused some physical break down of the cylinder wall, but I think this would be secondary to the real issue. If we had a million dollars and a lot of time on our hand maybe we could do a real study...wouldn't that be cool. I'd have to do all the test riding of course and you guys could be my mechanics! LOL :laugh: P.S. I could be way off base. I don't have a PhD. in Rocket Science or Motorcycle Repair so I welcome and thank you for any input...just stop stating it like there's no other possible explanation. :bang: :eek: [/QUOTE]
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Dirt Bike Brands - Other
00 kx 250 scratches on intake side of piston lines on the intake bridge of cylinder
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