compression??

[kineo3]

Does anyone know what the compression should be on a 00 400ex. I have a problem with oil coming out of my crankcase overflow and ending up in my airbox. The shop did a compression test and said it got about 140. Is this within spec, or do I have a problem.

[oynot400]

Oil coming out the crankcase breather is one of 2 things. The oil level is too full or you are pressurizing the crankcase with compbustion gas, ie blow by. I am not sure what kind of pressure it should be running but I would guess that you need either new rings or a bore job. :(