Members who have donated towards server costs
Join Date: Nov 2007
Location: Chandler, Arizona
My '02 has what appears to be a plug there too. I never noticed it before because it is covered by the footpeg bracket. It is directly above the coolant drain screw on the bottom of the engine, which means it is over the water pump. I could not find it on any schematic either, which probably means it is a permanent part of the engine cover, and not replaceable. I have never had the cover off on mine, so I don't know what is behind it. There are probably pictures on here somewhere showing the back side of that cover. It's possible it could be welded shut, or replaced with another plug, if not you would need to replace the entire right side cover.
IMO, there is no such thing as a "freeze" plug. They are correctly called "core plugs" The only reason they are there (at least on automotive engines) is to fill the holes left from casting the coolant passages in the block. Some racing blocks have them welded shut. They are a major problem on car engines, because they are prone to corrosion, and because of where most of them are located, you have to pull the engine or transmission to replace them. I have seen many blocks cracked from freezing, and never once saw a core plug pushed out. Some people think they were put there on purpose, to protect the block against damage from frozen coolant expanding. But that is not actually the case.
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