Is it actually hot by the gauge, or is it blowing coolant out the overflow?
If it's getting hot that quick, sounds like there is no circulation. That can be caused by a defective thermostat, internally clogged radiator, or in rare cases loose or broken pump impeller.
Is the air coming through the radiator hot? If no, there is no circulation. The upper tank should be too hot to touch, the lower tank considerably cooler. Feeling the radiator core, you should feel uniform heat, no cold spots. Cold spots indicate blocked passages.
If the coolant is blowing out the overflow before the temp actually reaches the boiling point, that is an indication of combustion gasses entering the cooling system, as in a blown head gasket or cracked head. Other symptoms are mystery coolant loss, steaming exhaust on a warm day, water condensing in the crankcase, misfire, hard starting as in locked engine when trying to crank.
Early on, not all symptoms will show, it can be difficult to see any, but still it tends to overheat. Try removing the plugs, let sit with pressure on the cooling system overnight. Crank it through and watch for coolant to blow out a cylinder. A combustion leakage test will sometimes be needed.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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