Ok well i just bought a bike, didn't look it over to well.... which is why i'm discussing my grinded off vin problems in another topic, BUT in this topic, i drained the oil to discover...a nice milkshake of oil/water. it's been sitting in a garage i THINK so the water isn't from outside sources i don't think, So are bikes just like cars? i'm a car guy been out of the bike scene for about 4 years, and never worked on a OHC motorcycle engine like this one, so i'm assuming it's the headgasket, is the head most likely warped? any input? it's a 1990 kawasaki ninja zx750r.