Wet sump reduction
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Cruiser
Joined: May 2010
Posts: 217
Likes: 38
From: NE Illinois
Wet sump reduction
Wet sumping is caused by too much oil sitting in thecrankcase when the engine is started. Theexcess oil is forced out of the crankcase via the breather tube and creates abig mess. The oil in the crankcase has two sources; the leftover from when theengine was shut off and the leakage past the oil check valve. The leakage is afunction of how long the engine sits without running and how well the checkvalve is working. You can reduce theremnant oil by allowing the engine to idle for a couple of minutes before turningit off. This allows the scavenge portion of the oil pump to evacuate as muchoil as possible. On my bike this can raise the level in the oil bag by aquarter inch or more. If you have a bottom breather you probably also have amanual fuel petcock. I close the petcock while the engine is running to liftthe fuel valve off of its seat while the bike is sitting.
Tourer
Joined: Aug 2006
Posts: 282
Likes: 7
From: Southern MD
Both of these suggestions sound excellent and I will add them to my bag of tricks to keep "Big Red" happy.
Don't forget to close the petcock and run it til the bowl is dry when the bike will be parked for a long time.
Don't forget to close the petcock and run it til the bowl is dry when the bike will be parked for a long time.
Seasoned HDF Member
Joined: Oct 2005
Posts: 7,495
Likes: 3,705
From: Santa Klaus County, Cali
Get a welding rod and weld it to the end of a good check valve and gently lap the seat area where the check ball rests. Won't take much....Clean the area real good and install a new check ball. At the same time you might want to install a new spring.
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