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Old 12-12-2019, 09:23 PM
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MotorDoctor MotorDoctor is offline
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Default One for our resident lubrication expert

Ron, here's a couple of pictures of a motorcycle engine submitted for warranty consideration. Putting together a report for the boss to consider and wanted to get the terminology right. The burned oil residue on the rod big end, would you call that "carbonized oil residue"? This is your typical warranty request, "I was just riding along, minding my own business when suddenly it started knocking". It's a 250cc twin that we really haven't had any issues with. This one only has 4200 miles on it, will need a couple more pictures from the dealer. The cylinder head doesn't show any oil starvation damage on the bearing journals. According to the dealer, the oil level was correct and the oil looked dark but serviceable. Thanks for the assist.
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Old 12-12-2019, 10:13 PM
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greywynd greywynd is offline
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Looks like the crank journal got a wee bit warm!


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Old 12-13-2019, 04:46 AM
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I would mic the crank journal for size and the rod ID, looks like there may not have been enough bearing clearance for oil.
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Old 12-13-2019, 06:39 PM
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Failure mode:
"Burnt and scored bearing surfaces from lack of lubrication."

If the oil level was correct then.

1. Oil pump failure.
2. Stuck open pressure relief valve.
3. Blocked oil galley or oil port.
4. Wrong viscosity oil or wrong oil completely.
5. Blown seal somewhere that created low oil pressure.
6. Moron in the seat running over red line for too long.
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Old 12-13-2019, 06:41 PM
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Sorry for the delay, the sailor surprised us with a visit yesterday, this was
his Christmas leave. He will actually be working on Christmas Day.
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