"After tune up and gain of abo
"After tune up and gain of about 5 mph and 300 rmp, I have developed an overheating problem. Below 3,800 rpm engine stays at 190 F. Above 3,800 rpm, engine quickly overheats. Cools back down soon after reducing rpm. I pulled the thermostat and it checks out ok in hot water. New impeller works good. Any ideas on what is wrong and how to fix would be greatly appreciated."
"After tune up and gain of about 5 mph and 300 rmp, I have developed an overheating problem. Below 3,800 rpm engine stays at 190 F. Above 3,800 rpm, engine quickly overheats. Cools back down soon after reducing rpm. I pulled the thermostat and it checks out ok in hot water. New impeller works good. Any ideas on what is wrong and how to fix would be greatly appreciated."