evinrude 235 84 model when full thodel trips alarm

[jboyd100]

okay just picked up this 1976 wellcraft this weekend and it has a 1984 evenrude 235 on the back with alot of new parts on it and it runs great. I run it all day sat but here is the problem if you run it 3/4 or better throtal it trip a busser like over heat then you throtal down and it goes off in a a few min i can run it all day at 25mph gps no problem. it has a new water pump in 2004 and thermostat. i ordered a new thermostat though. it is pumpumg water ca use I see a good sream out the pee hole. i did have bad gas in it when he brought it friday and it broke down on us that when i found out he didn't empty the old gas out from sitting for a year. i drained the gas out completely and put high octane in 93 to be exact. i do have the book to refer too as well. I checked compression and they all read about 90 with a cheap guage from harbor frieght. they all read the same though. i can leave my hand on the top of the motor and i don't have to move it from being to hot but the head are hot to the touch. i read somewere it could be a fuel restrictor also triggering the sensor. any help would be great to trouble shoot this thanks. james boyd