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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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