My 1650 had the same problem when worked hard in warmer (75+ deg) weather. Turned out heat from the engine was boiling the gas in the tank/fuel line to boil which then starved the carb for fuel. Could tell by removing the gas cap and peering into the tank when it began losing power - it was like looking into a boiling teapot.
Solution was straight forward:
1 - Remove the side panels so hot fan blast is not caught under the hood
2 - Install a sheet metal shield between the engine and the fuel tank then stuff insulation on the topside of the shield.
3 - Wrap the fuel line between the sediment bulb and carb inlet with insulation.
Incidentally sweating of the carb exterior (and a buildup of frost on the carb in cooler weather) is perfectly normal.
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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