Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Weird under load symptom briggs 17.5

I am working on a Troybilt riding mower w/17.5 briggs engine and it is cutting out under load. I am a small engine mechanic so i have already cleaned carb(only one adjustment screw), replaced gas, plug, oil is good, new air filter...adjusted valves..looked at filter, fuel lines..I replaced electronic shut off on carb with a bolt....nothing helps. It happens when i engage the mower...or when I quickly shut off and restart. I am going nuts.....compression is good...I replaced coil and still no help...no matter where i adjust screw on carb it acts the same. Runs perfect until it goes under load. I can make it come out of it by engaging choke...so it seems gas related...but where...how....?

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A couple other checks would be to dump the carb resevoir where the float is, water under the float could be accumulated and closing the fuel off, due to density. out here on the farm we never use the gas to the last drop from the can. also the linkage between the motor fan blade, (govenor) might have been connected to the carb incorrectly. or a bad switch interlock on the mower blade.
some briggs motors are hooked wrong straight from the factory, where the throttle linkage is concerned. ( and the little spring is pretty hokey too)

Posted on May 17, 2009

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Posted on Jan 02, 2017

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