KZ 305 - Dark oil question - Kawasaki Motorcycle Forums
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post #1 of 2 (permalink) Old 08-21-2019, 11:57 AM Thread Starter
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KZ 305 - Dark oil question

I've started a few threads on here lately as I work out the bugs on this bike I've recently purchased so thanks for your patience.

I changed the oil after getting it I was concerned with how dark it was. So I drained it, filled it with fresh stuff, ran it for 1/2 mile then drained it again (it was already dark). Then I put in a new oil filter then filled it with more fresh oil. It's been about 200-300 miles and it's all super dark again. When I drained it last night the oil coming out looks like dark brown metallic paint. It's actually crazy but it swirls like metallic paint does and it's full of super fine sparkles. I can't imagine this is good but can someone fill me in here? What should I do here?

Bike has 10k miles on it so who knows if this is old sludge coming out from previous owners or not. I noticed maybe one or two flakes of aluminum in there but that's it. Everything was super fine.

Thanks for the help!
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post #2 of 2 (permalink) Old 08-21-2019, 02:07 PM
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I don't know what you should do. When draining the oil, is the motorcycle on the center stand or otherwise level?
Without running the engine, I might consider flushing the engine with kerosene or diesel fuel & do a final flush with cheap engine oil to remove as much of the kerosene/diesel as possible. But someone else probably has a much better idea.

I don't think the KZ305 has an oil pan. On a KZ650 I would remove the oil pan to see how bad it is.
On your bike, I guess you could remove the clutch cover to get a look inside, but I don't know how helpful this would be.
EB photos might be of use if you're unfamiliar with the 305 engine.


1981 KZ650-CSR. Competition, Sports & Road.
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