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Hello everyone. I'm Jeff. I've been operating a small lawn business for about 8 years. My favorite mowers are my two Toro Commercial 21" with the Honda engines. One of my customers recently gave me his Lawn-Boy SilverPro Series with the 2 cycle Dura Force engine. It's in great shape. I thought I might use it to mow my yard because it's really light weight and runs great. Thing is after using my Toros for so long, it seems like it just creeps along speed wise. Anyone familiar with these? Can the tranny be beefed up to move on pace with my Toros?

Hi, Jeff. Welcome to the forum! :welcome:

I'm going to move your thread on over to the Lawn Boy section to see if we can help you get that mower going a little faster.

If you got the 4.5 hp model, it travels a bit slow (in my opinion) but this is relevant to RPM. If you run your mower on full throttle it will travel faster. Of course you may have a stretched belt and it would cause it to slow down. The larger 6.5 hp Lawnboy DuraForce moves along at a much faster clip.

Thanks for the reply. It is the 6.5 hp. I'll take a look at the belt.

Make sure you grease the transmission zerk fittings on each side of the housing. Clean the air filter and keep the blade very sharp. I find the Duraforce L.B. single speed is fairly fast and I'm tall with long legs.

Jeff

Jeff, are you referring to the zerks at the rear wheels, or are there others that I have not attended to?

If the engine doesn't slow down when you pull on the bail to engage the self-propel then lack of lubrication is not the issue, even though good housekeeping means you should lubricate.

The zerks are just for the sprockets on rear wheels, to grease gear box you have to take the bottom cover off.

If you have the same 3 speed transmission that I have with a duraforce 2nd is plenty fast, I cannot ever think of using 3rd, you almost have to run to keep up. You have to remove engine block from exhaust plate to remove belt. Not as bad as it sounds, make sure to not lose exhaust gasket. Make sure the gear box is putting enough tension on belt, there is a spring you can adjust.

If he has the Silverpro, he doesn't have the 3 speed tranny. I have a 10547 with the 3 speed, and yes 3rd gear was for sprinters, lol.

If you remove the rear wheels and black plastic gear covers, you'll find packed old grease and grass. Clean that out and regrease. Grease the wheel axle bolts. I find the ground speed increases noticeably after performing this basic maintenance work.

Forgot to mention, if the previous owner had the mower set up for mulching (it will have the Easy Mulch cover plate), chances are the black plastic belt cover is completely packed with grass. The 10323 I just bought off Craigslist had this condition.

Jeff

JP thanks. Mine is a 10323. He does have it set up for mulch. That's probably what it is.

As a last resort you can adjust the air vane governor (to increase the engine speed) if you feel the engine is running too slow, you can adjust the engine RPM by turning the toothed wheel just below the air vane using this procedure. On the left side of the mower (as viewed from the operators position), grab the air vane with one finger (to keep it from pivoting) and turn the toothed wheel below it clockwise (or to the left from that position). Each click increases the engine RPM by 50-70 RPM.

Jeff

I have a Duraforce 6.5 2 cycle, and I believe it is the best mower I ever owned. When mulching (which is all I ever do), the grass clippings do accumulate under the self propelled cover. Just a small screw to take it off and clean it, and it's ready to go. I have had this mower since 2004, and it really runs fast. I have learned to keep the carburetor clean, new plug every year, grease the fittings, and I would not trade this one for anything. Lawnboy always had a really good 2 cycle. Wish they still made them.
Ed

jp1961 said:

As a last resort you can adjust the air vane governor (to increase the engine speed) if you feel the engine is running too slow, you can adjust the engine RPM by turning the toothed wheel just below the air vane using this procedure. On the left side of the mower (as viewed from the operators position), grab the air vane with one finger (to keep it from pivoting) and turn the toothed wheel below it clockwise (or to the left from that position). Each click increases the engine RPM by 50-70 RPM.

Jeff

Click to expand...

Always wondered what that wheel was for! Thanks for sharing.... great info.