SOHC.co.uk Forums > CB500/550
Crankcase Breather
Trigger:
--- 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 ---
The rebuilt engine requires a full service after 500 miles run in period and you would of noticed if it was low then.
You should not have any oil coming from the breather unless the engine is old and high milage. Was the piston to bore clearance correct at the time of rebuild ?
deltarider:
I think we have to distinguish between oil pouring and tiny oil spats. The latter I have always had after hot rides for 43 years.
Neill C:
The rebuild was carried out by a classic Honda specialist and had a rebore with larger pistons so I assume they are OK. The oil isn't pouring out. Just enough to wet the end of my finger
Trigger:
A little oil can depend on a lot of things, including the grade of oil in the engine. If you have drips on the deck, i would suspect that it was not rebored to the correct spec .
Neill C:
Assuming that is correct and I can't go back to the garage that did it as it was 3 years ago now and seeing as I only use it for coffee and chip shop runs should I just live with it?
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