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Join Date: Nov 2007
Location: Chandler, Arizona
There is a weep hole next to the coolant drain plug, which is designed to let you know when the water pump mechanical seal is failing. I have never had a Vulcan 750 engine apart, so there may be oil on one side of that seal. If the bolt has been removed, the cooling system would be empty. However, draining the coolant would not cause an oil leak. If oil is coming out of that hole, it already had an oil leak. I would first make sure that is where the oil is coming from, check to see if there is coolant inn the system, and assuming there is not, make sure the bolt is in place and refill it with coolant, check the oil level, and try starting it. Then watch that hole and see if anything comes out. Since you said you did the tuxedo mod, if you did it without first removing the stator cover, there will be a considerable amount of metal shavings in the oil. Those could have damaged the water pump seal.
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