Dripping oil from hose
Posted October 04, 2007 - 07:07 PM
Posted October 04, 2007 - 08:41 PM
I have an '01 WR426. Just had the motor rebuild over the summer. Why do I have oil dripping out of the large breather hose that comes out of the valve cover? This hose is about 1/2 inch in diameter comes from the valve cover and loops its way under the motor. Any help would be great.
Some is normal, excess means pressure is leaking past the rings and filling the crankcase with some extra pressure (blowby gasses), if it was just rebuilt, it will take a little while for the rings to seat.
Posted October 05, 2007 - 09:33 AM
Posted October 05, 2007 - 10:34 AM
1. start and idle bike for 2 minutes
2. Shut off, let sit for 30 seconds
3. hold bike level, take out dip stick, wipe, insert but don't screw in pull out and check level mark.
Any other way will give you a false reading according to Yamaha.
Lots of people reroute this breather into the airbox to avoid staining the concrete in their garage, also, the factory location can casue you to suck in water if you ever stall it while the hose end is submerged. A simple T in the line up high can avoid the sucking up of water.
Posted October 16, 2007 - 05:13 PM
Posted October 16, 2007 - 06:07 PM
1. Too much oil
2. Rings are still seating
3. Rebuild has gone wrong
If you've put any kind of mileage on the rebuild, then I would probably go with number 3 unfortunately. If you paid to have it rebuilt, take it back...SC
Posted October 18, 2007 - 06:04 AM
Posted October 22, 2007 - 11:12 AM