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When did they come out?A friend of mine has one,and he says it's at least 10 years old.I didn't think they made them back then.
 

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Yeah they have been around since the 90's they started out with the Briggs motor, then went to the tec. motors, my dad bought one new in 2000 with a tec. engine and then I went and got a new 10324 just didnt much care for his, but it is been a good running mower nothing like a two cycle...
 

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There's a four stroke nearby me I was thinking of looking at. It's a 10516 5hp aluminum deck self propelled. Kinda looks like a 10547 handle and deck with a 4cycle B&S engine. I'm still not sure yet.
 

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I had a SilverPro self-propelled Lawn-Boy with a Tecumseh engine on it. It's at my boss' rental property now. I mowed with it once, and that was enough. For the average Joe, it's probably fine, but it wasn't even in the same league as far as power and torque as a two-cycle Lawn-Boy engine...Even a V engine!
 

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The only Lawn Boy I've ever had is a '94 4 stroke. Y'all are making me wish I had a 2 stroke tho.
 

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Find a 10515 or 10525 if you want a nice 2-cycle machine. The F and DuraForce engines respectively are both powerhouses and run very nicely. I used to think that my DF was such a "bad boy" as far as power goes, till I mowed the same lawn with a 10545 (5 HP F engine w/ electric start) and it ripped thru it just as well, if not slightly better! Torquey as they are, the DF has a certain "flat spot" in its powerband...Work it too hard and the revs will drop off, and it stalls. The F will chug along at a much lower RPM under full load without faltering.
 

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I know I'm gonna get raked over the coals for this, but my first Lawnboy was a four square rear bagger Briggs powered engine from about 1987! It goes against the grain I know but that was actually a pretty good running old mower. I wish I would have kept it (for nostalgia only of course).
 

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"Torquey as they are, the DF has a certain "flat spot" in its powerband...Work it too hard and the revs will drop off, and it stalls. The F will chug along at a much lower RPM under full load without faltering."

Very true from my experience. I use a 4hp F-engine to mow over at my sister's place, and when I mow the grass there it is always over a foot tall, and I mow weekly there. With the F-engine, it just steadily hums right through it with no problem. My duraforce revs like nobody's business, but when you put it to the thick stuff there is a noticeable decrease in speed and if you mow too thick of grass, it slows down pretty slow. I have a D-engine bricktop that runs the same as the F-engine, it runs at a slower RPM like the F-engine yet just sails through the thick stuff. Now don't get me wrong, I love my duraforce but a simple F or D-engine does the job and does it well.
 

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I think a lot of it has to do with the port timing/design and the emissions-friendly lean-burn carbs on the DuraForce. If my DF seems like it's going to stall, sometimes a quick blip of the choke lever enriches it enough that it'll power thru without stalling. Sort of like an accelerator pump.
The M-series was also like this, but its being a piston ported engine, this kind of came as little surprise to me. They never seem to have the "grunt" of a reed valve engine at low RPM, high load situations. My M would fall on its face once the RPMs dropped below its "sweet spot". I stalled that mower more often than any other Lawn-Boy I'd ever owned prior.

From my experience, the D-600 seemed to have the best lugging power. They could putter along at what seemed like an insanely low RPM, and recover just fine. Sometimes they'd lug so slow I could almost count each firing pulse, but it was very rare that I ever stalled one.
 
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