Troubleshooting - oil leaking engine

NorwegianXS

I got a xs engine that have oil leaks from the sylinder foot gasket, head gasket, timing cover + +. Well it seeps oil from just about every possible place above the crankcase.

Could it be internal pressure in the engine?

yamaman

Could be a blocked breather. You running a stock airbox?
Start it up with the dip stick removed & feel if it's pumping.
A fair chance that your breather is all sludged up. Just pul it apart & clean it all up.

A engine by its very nature, is a air pump on both sides of the piston rings! That's why we have breathers, even on the best engines, you will get some leakage past the rings, then with the decending piston pressurising the air, it's all gotta go somewhere. So yep, if your breather is not working properly, then that pressure will find the weakest spot & make a push for it!

Obviously it's easier to push through a gasket than a solid wall, so it will leak & take oil through with it.

If your not running a air box, how do you have your breather hoses running? Mikes breather kit could be a good option. Cheers

NorwegianXS

Its not on the stock airbox.
It got some sort of aftermarket airfilter.

The breather hoses are going straight out behind the engine.

The engine is out of the frame, so its not possible to start it up.
Is there some other way to test it?

yamaman

Have a read here, hope it helps:

650rider.com/index.php...sc&start=0

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Yamaha xs650