Briggs & Stratton on a Yard Machines races

malibusterMay 7, 2012

Hello, I was hoping someone could help me out because I'm kind of at a loss here. I got this mower which is actually in pretty good shape from a neighbor because they had problems with starting and keeping it running. I dumped all of the gas out and cleaned out the carb. I put a new diaphragm on even though it didn't look too bad. Primed it and started it up first pull but this thing just screams. I thought the smaller governor spring looked funny so I replaced it, same issue. I can can reach down and move the governor by hand and that idles it down. There is nothing impeding the governor at all.

Mower - MTD 11A-414088 (Yard Machine)

Motor - B&S 10A902


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Look for the throttle shaft stuck wide open.
Had the same thing happen on a tiller.

When you shut the engine off, the governor opens the throttle valve wide open. After sitting a few months, it can get stuck from gum/varnish.

    Bookmark   May 7, 2012 at 8:51PM
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