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View Full Version : 400ex losses oil from crankcase breather


112277
08-05-2008, 12:53 PM
rebuilt 400ex motor losses oil from crankcase breather only during a wheelie or steep hillclimb
400exrider707
08-05-2008, 01:21 PM
My guess is either the motor has too much oil, or possibly the rings are shot.
112277
08-05-2008, 02:37 PM
it has a new piston rings cam chain rod the works had it bored the end gap on the rings is good i have checked the oil cooler for flow and the tank and also the lines the oil level is correct i also tried running the oil low and i get the same result i have no blowby and the compression is good
112277
08-14-2008, 06:47 AM
I FOUND THE PROBLEM AND FIXED IT. THE CENTER CASE GASKET DID NOT HAVE THE HOLE PUNCHED IN IT FOR OIL TO FLOW THROUGH.
jeepthing07
08-15-2008, 12:48 PM
Originally posted by 112277
I FOUND THE PROBLEM AND FIXED IT. THE CENTER CASE GASKET DID NOT HAVE THE HOLE PUNCHED IN IT FOR OIL TO FLOW THROUGH.

it didn't have a hole in the area at the top where the breather is?

im rebuilding mine so im going to have to double check that. im useing a moose gasket kit