MOST cooling system problems fall into two categories: lack of flow, and leaks.
Lack of flow can be from a bad water pump impeller, slipping belt, low coolant level, blocked coolant passages in the block or head[s], faulty thermostat, or collapsed hose[s]. Lack of airflow through the radiator can also be a cause of overheating, as well as blocked tubes/insufficient capacity of the radiator causing insufficient coolant flow.
Leaks can be external, as in coolant leaking FROM the cooling sstem. Leaks can also be internal, as in combustion gases leaking INTO the cooling system via a bad head gasket or a cracked head or block.
So take the information I've given you...then apply the information you already know to eliminate some of the POTENTIAL causes of overheating. What's left, then, are the POSSIBLE explanations for your problem. Long-distance diagnosis being an inexact science at best, I wish you well in your attempt at finding the cause and solving the problem.
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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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