lawn mower runs on very high and stops


Old 05-31-07, 03:15 PM
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Join Date: Mar 2007
Posts: 8
lawn mower runs on very high and stops

This is a MTD yard machines 3.5 hp B&S engine. When primed and started it runs on very high for a few seconds and stops. I also noticed that the muffler gets really hot just during these few seconds. It doesn't have a throttle control. Until this happened it used to run OK. I cleaned the carb, filter, and changed oil. Not sure what the problem is and where to look for. Thanks for any suggestions.

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Old 05-31-07, 04:58 PM
puey61's Avatar
Join Date: Apr 2004
Location: Upstate New York
Posts: 3,224
Being a 3-horse this is likely a "Classic" style Briggs engine utilizing an air-vane governor. If your cooling fins are plugged tight with grass debris this will affect both the cooling ability as well as the operation of the governor (throttle). Remove the flywheel blower shroud and have a look for any accumulation of debris.

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