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Join Date: Nov 2007
Location: Chandler, Arizona
If it is oil, it could be the water pump mechanical seal, a head gasket, or even a crack in one of the cylinders or heads. But I would not jump to conclusions yet. If it is that bad, I would remove the radiator, and the thermostat (which could be bad if it overheated quickly), all the drain plugs, and give it a good flushing out. If it's REALLY bad, I would use a flushing chemical designed for aluminum engines. I normally don't recommend doing that, as it is hard on aluminum, but if your cooling system is plugged up somehow, it is to late to worry about that. Stick a hose in the inlet, and let it run for a while till it comes out clear. After a good cleaning, and after getting everything put back together, I do recommend flushing it good with distilled water to remove all the mineral water and flushing chemical, before filling it up with fresh coolant.
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