I have an 86 LT250r which has problems overheating. The motor is bored .080 over, the shop that did the rebuild said being .080 over won't cause heating problems. The jetting is good and I'm running at 32:1. I took the cover off the water pump to take a look at the impeller. It looked good but the shaft the impeller is mounted has some slop. It'll move slighty up and down maybe a 1/32 of an inch. Is this normal? Do I need to worry about that? What kind of play is accectable on the impeller shaft?

Help!!!!!