Question by  runninghot84 (4)

My motorcycle is losing oil and I can smell it, but it has no leaks, what is the problem?

My friend told me I have to rebuild the bottom end because it is getting past the rings.


Answer by  switcher (48)

The oil may be getting past the rings or past the valve guides if it is a four stroke motor. Rings and valves are in the top end of the motor, not the bottom. If the valve guides need replacing it should be done by a specialist machine shop.


Answer by  Jimbob (2275)

It is probably getting past the rings and then burning in the cylinder. You need to replace the top end not the bottom.


Answer by  Amber40 (24961)

Your rings are probably getting too worn. Instead of cleaning the oil off the side it is staying on and some is leaking by into the cylinders. Then it is being burned off during the combustion cycle. The only way to fix this is to tear the engine down and install a new set of piston rings.


Answer by  palmerino (637)

You are probably buring oil. Your friend could be right about the rings, but oil could also be getting past the valves.


Answer by  Amber40 (24961)

As a bikes engine get mileage on it it is not unusual for oil to start leaking past the worn cylinder rings. Typically the only way to correct this is to take it apart, clean up the cylinders, and install new rings.

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