Hi all. I have a Yamaha xs400 after is warm leaks oil true the air filter please help. Reagards and thanks?

Question

I start my machine after 1 1/2 year

Answer 1

That's usually because you have way too much oil in there. There's a crankcase vent hose going from the top of the transmission to the air cleaner. That's the only possible way for oil to get to the cleaner.

If it's not too much oil that's the problem, you can take the vent hose off the cleaner and put a crankcase breather filter on the hose. That way you won't have the vacuum of the air cleaner sucking air through the hose.

Answer 2

Probably coming from the crankcase ventilation.  Check the sump level first thing.

Answer 3

Check the oil level, heard of it happening when there's to much oil.