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Have you checked your exhaust muffler body for blockage. There is a water cooling hole orifice that gets clogged up with carbon and sediment deposits. When clogged up it causes overheat.
This orifice is at the very bottom of the exhaust body aluminum elbow. To check it you have to remove the exhaust body.
The orifice is about 1/4" in diameter, and it sprays water into the water box to cool the exhaust.
I had the same issue you have, on my exhaust body it was so clogged up I couldn't even find it.
The water flow may be OK until it overheats.
 
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