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 - Sunday Drives - by Cowboy. Summer was finally upon us here in Northern Maine. We have two types of industry up here, one being "Forestry" (Wood Products) and the other "Farming" (Potatoes). There is no shortage of farm tractors and equipment around here! I have been restoring old Farm Tractors for the past 6 years, and have found it easier and less expensive to hit all the auctions and purchase whole tractors for parts needed. My wife who works at a local school, and only has weekends and summers off, while on t
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