60hp mercery tracker, around 99 or 00 model, starts great, runs great, will go full speed troll ect. but after it gets hot will shut down when running full speed, will start and run 1/2 throtle or let cool and will be fine for awhile. Have run carb cleaner through carb, replaced fuel line from tank to moter (thought it might be getting air in the line) made sure fuel cap was breathing. What next, power pack???????????