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Join Date: Nov 2007
Location: Chandler, Arizona
4 oz should not be a problem with the Vulcan filter either. I wouldn't have a problem filling it up while it was horizontal until oil started coming out, then stop. you would need to stuff a rag down between the starter and the engine, or oil will run down behind the starter where you can't get to it. I've done that a couple of times, and used practically a whole can of carb cleaner getting all the oil off. Now when I remove the filter, I have a flat piece of cardboard slightly curved, to use as a chute to put under the filter mounting boss so when I remove the oil filter, all the oil, and there is a lot when you remove the filter, even after draining the crankcase, will run down the cardboard and into the pan, and not make a mess. I also drain the oil with the bike on the centerstand, with a piece of 2x4 under the right side, and the sidestand up, to prevent soaking the sidestand with oil.
The Sportster is a bit different, having a dry sump engine, so putting a little oil in the filter to help prime it is probably a good idea. I have never owned a Harley (still looking, it WILL happen), but I have never seen anything in any service manual for any vehicle to fill the filter with oil before installing it. It does make sense, especially if you have a vertical filter. But if you change the oil, get down on the floor where you can get a good view of the sight glass, and have someone else start it, the oil level drops instantly, so there is obviously some oil still in the pickup tube. I don't think Kawasaki would design a lubrication system that was not self priming. Even a new engine from the factory you just put oil in it and start it up. On a rebuilt engine, you need to prime the engine the first time, usually either by turning the distributer shaft with a drill until oil starts squirting out through the head, or if there is no way to turn the oil pump, pack it in Vaseline. It will start pumping immediately, and the Vaseline just melts into the oil. Jerry.
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