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Old 09-19-2022, 04:29 PM
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Default Engine carnage

Here's some photos of a single cylinder 4 stroke engine that came apart. Waiting for more photos to determine the cause of the wreckage. The engine and oil tank holds ~ 2,000 cc of oil and only had 1100 cc in it. Fresh oil in the oil tank, black oil in the engine. The second picture is the bottom of the cylinder & piston, looking up from the crankshaft. Be interesting to see how the other parts look (cylinder head, cam bearings, cam shafts)
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Old 09-19-2022, 05:36 PM
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Quote:
Fresh oil in the oil tank, black oil in the engine.
Somebody change the oil after the "event"?
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Old 09-19-2022, 05:52 PM
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Usually they add oil so it doesn't look like it was run out of oil. Parts don't lie though
Fresh oil in an engine that is destroyed is usually a sign it was run out of oil, then topped off with fresh oil. I guess they think we're just not that smart
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Old 09-19-2022, 06:09 PM
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[I] What RPM was the admit to . NO oil high RPM not a good combo . How many new bikes has be bought ?
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Old 09-19-2022, 06:12 PM
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I wouldn't try to rebuild that one
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Old 09-19-2022, 07:07 PM
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Quote:
Originally Posted by Ironman View Post
I wouldn't try to rebuild that one
If you do, start by adjusting the tension on that chain.
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Old 09-19-2022, 09:51 PM
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Quote:
Originally Posted by Ironman View Post
I wouldn't try to rebuild that one
What, not up for a challenge today?

Having run some fairly high-performance engines I'm always a little bit surprised (or, perhaps, impressed) by how well they do hold together. It's hard to visualize all those parts whizzing around at 7000, 8000 or even 10,000 RPM. A lot can go wrong in a heartbeat...
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Old 09-19-2022, 10:33 PM
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What kind of bike? Warranty claim? Do you think they starved it by wheelie-ing?
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Old 09-20-2022, 07:17 AM
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Quote:
Warranty claim? Do you think they starved it by wheelie-ing?
Yes to both but the jury is still out until I get more photos. I like to check the oil pump flow prior to engine teardown but in this case, a little hard to do.
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Old 09-20-2022, 11:34 AM
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Its MHO that it won't buff out...
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