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Join Date: Nov 2007
Location: Chandler, Arizona
A bad seal will cause that, but so will too much grease on the splines (the ones that mesh with the rear wheel) will to. I used to use Kawasaki shaft drive oil, but I don't think Kawasaki makes shaft drive bikes anymore. When you said wash, I hope you didn't mean pressure wash. That will destroy seals quickly. I recently bought a 1997 with 21,000 miles on it. The back wheel was filthy. But none of it looked recent, The final drive was full of decent looking oil, and both the wheel and driveshaft splines have grease on them. Oh, there is also a small vent hole on the inside of the final drive unit behind the wheel. If you seriously overfill the final drive, oil can come out through that.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike