The question is after you stop a bit and take the load off will it then recover on its own and pull good again for a bit? If so that is a a fuel delivery problem. Do you know about the fine strainer screen in the fitting on the carb where the fuel line attaches? See link. Checking the flow out of the drain on the carb you should run over a pint measure in 2 and 1/2 minutes and you cannot count the first 8 to 10 seconds that drains down the fuel in the carb bowl. That is 3 gallon an hour. Test says the M used 3.75 GPH under full load, it will probably use a bit more since it has probably been overhauled at some point with over bore pistons. It you pull the line off the carb and open the shut off valve. It should flow out of that line similar to a good 2 - 3 beer experience in bathroom. Check down through the fill neck in the bottom of your gas tank with a good flashlight for crud that can block the top of the sediment bowl.
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Today's Featured Article - An AC Model M Crawler - by Anthony West. Neil Atkins is a man in his late thirties, a mild and patient character who talks fondly of his farming heritage. He farms around a hundred and fifty acres of arable land, in a village called Southam, located just outside Leamington Spa in Warwickshire. The soil is a rich dark brown and is well looked after. unlike some areas in the midlands it is also fairly flat, broken only by hedgerows and the occasional valley and brook. A copse of wildbreaking silver birch and oak trees surround the top si
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