Are motors interchangeable among decks?

john703June 29, 2007

Can I put, say, a 300 or 500 series Briggs on a fifteen year old Lawn boy deck?--Does anyone know? Can a mower deck, in general, fit many different motors, or just the one it came with? The Lawnboy I have smokes very badly, but it's a great deck. Aluminum. Very good shape. Was wondering if I could just go buy a $100 dollar mower at Walmart with Briggs on it and install it on the Lawnboy deck. I'm sure the answer is no, but thought I'd check. Thanks!

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rustyj14(W/PA)

I'm not sure about Lawn boys, but most any other make of push or self-propelled lawn mower deck is now drilled for most engines. By that i mean you might have to replace an engine that has the spark plug at the front, and another engine might have it at the back, which is done by turning the engine a half turn around. Some of the controls necessitate turning the engine to hook them up! And the later decks have six mounting holes. Take yer pick!

    Bookmark   June 29, 2007 at 10:49PM
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mattv21(z9 Houston)

The deck bolt patterns are pretty standard, it seems. The key things you need to match up are the crankshaft length and diameter, and the control locations (or fabricate new cable lengths and ends). Given that Lawnboy put Tecumseh flatheads on a lot of staggered-wheel decks, I'd start my search there. Those engines should be easy enough to find cheap.

    Bookmark   June 29, 2007 at 11:22PM
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1saxman

John, which model LB do you have? Is it a 4-cycle or 2-cycle? What engine is it?

    Bookmark   June 30, 2007 at 12:10PM
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walt2002

"The deck bolt patterns are pretty standard, it seems."

Not so IF the original LB was a "real" Lawn Boy, a 2 stroker.

Walt Conner

    Bookmark   June 30, 2007 at 1:35PM
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john703

Thanks for responses everyone. Saxman1 and Walt2002: it's the "real" 2 stroke. 19" 4 hp S19ZPM. Serial L080C0086. Thanks.

    Bookmark   June 30, 2007 at 3:17PM
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walt2002

I think you will find that the opening in the aluminum deck LBs is too large for the bolt pattern of 4 stroke engines. You might be able to rig an adapter plate, never had any desire to try that, don't know about your shaft length.

Walt Conner

    Bookmark   July 1, 2007 at 12:20PM
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john703

Well heck. Sounds like it's more trouble than it's worth. (The trouble of figuring it out, if nothing else). Thanks for your help everybody.

    Bookmark   July 2, 2007 at 11:19PM
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