Hello. Hoping someone with some knowledge maybe able to help me out. I recently purchased a 1997 Kawasaki KDX220r. I had ridden it about 50 miles with no problems. On my last ride I started to smell coolant. I stopped and shut the bike down. All I was able to see was a little spot of coolant on one of the cylinder base bolts and I noticed that the oil in the sight window of the side cover was frothing looking. The part that scared me was that I could actually hear and see the coolant in the overflow bottle boiling. I called the local dealer and bought what I thought were the neccessary parts to fix it but it didnt work. I replaced the head and base gaskets first. Then I took off the waterpump and the right side engine cover. I put in a new inner oil seal and bearing (on the case cover) for the water pump. I also replaced the cup shaped seal and o-ring directly behind the water pump impeller. Last thing I did was replace the seal on the back of the impeller that meshes with the inner seal behind the o-ring. I put everything back together and filled the radiator with coolant and the case with oil. I took it out for a 10 minute ride. Check over all the bolts and looked for leaks and everything looked good. That was until the other day when I took the bike out for a trial run before the enduro coming up this weekend that I am running. After about 20 miles of riding I stopped for a drink. Once again I heard the infamous noise of the coolant boiling in the overflow and once again there was coolant in the oil in the case. I am not sure where to go from here. Basically I replaced everything in the cooling system that can be routinely maintained. There is no loss of power or hesitation like the bike is running hot, but obviously something is still not right. Any help would be greatly appreciated. Thanks MIKE 609-413-3984 or jmpooh76@verizon.net