SOHC.co.uk Forums > CB500/550

Crankcase Breather

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Neill C:
Hi all. I've 1500 miles since having an engine rebuild and have a small amount of oil coming out of the crankcase breather. I think this only happens after I've ridden it at higger speeds than normal. Is this something to worry about?

Nurse Julie:
Check the oil level correctly to start with. It should be just fumes coming out of the breather but raised crank case pressure could cause oil to come out.

deltarider:

--- Quote from: Neill C on August 19, 2023, 06:23:43 PM ---Hi all. I've 1500 miles since having an engine rebuild and have a small amount of oil coming out of the crankcase breather. I think this only happens after I've ridden it at higger speeds than normal. Is this something to worry about?

--- End quote ---
No, normal.

Neill C:
Thanks guys. I'll check the oil level in the morning.

deltarider:
If you keep the oil level somewhat lower than MAX, you will see less oil coming out of the breather tube.

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