I've got a slooooow leak on my '02 Duke ll petcock (it's the Mikuni CK-69 '96). I haven't had it apart yet but I'm guessing that there's a lil' seal in there that needs replacing. Trouble is, I can only find the petcock assembly complete for about $50... Anybody know if an automotive gasket will cure it? Or do I need to man up and buy the whole thing?