Ok, here we go again. I'm losing anti-freeze out of the overflow on my 85 Tri-z. The water pump was bad when I bought the bike and has been replaced. The radiator cap is good. The cylinder has a fresh bore with new piston kit and gaskets. My thoughts are that the previous owner overheated it when the water pump went out and cracked a water passage in the cylinder. I don't believe that it's the head, because I swapped heads and the problem still occurs. You can ride the bike without losing too much coolant, but it gets real annoying. I just want the bike to be correct, so I can ride it without constantly smelling anti-freeze and checking the resovoir. Anybody have any input? If it's the cylinder, what swaps with a stock Tri-z cylinder or can it be repaired? Also, how can I check to see where or if it's cracked?