Small Engines (Lawn Mowers, etc.)/Higher Top end Please


Dear Sirs Please Help I have a Troy-bilt super Bronco with a Automatic tranny that's sick. I don't cut grass with this one but I do have a dozer blade on it. I'm a Disabled Vet "Can't Drive Car" But I can drive my tractor. I would like to have a higher top end. Any Ideas? Thank You


25842 Streator Dr
Broken Arrow OK 74014-2739
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It can be very challenging to change the speed on hydrostatic transmissions.  You options are:

1)  Change the pulley on the transmission input shaft.
   Issue:  Different size pulleys are hard to find and can be very specific.  Not likely to find an off the shelf part.  Custom made pulleys can be very expensive and you would probably have to change the belt size (length).  With the automatics even changing the input pulley may not change the high speed as some transmissions have a maximum RPM.

2)  Change the engine pulley.
   Issue:  Easier to find but the belt and max input RPM on the auto may not make a difference.

3)  Change the tire/wheel size.
   Easiest option
   Issue:  Costly to replace wheels/rims and tires.  Fender clearance?  The size difference would have to be significant to notice a speed change.

Other options:
Buy an older riding mower with a bad engine but has a gearbox with a sprocket output and a sprocket differential.  Swap engines and then source sprockets.  Sprockets are much easier to find as they are used in many go-kart applications.


Small Engines (Lawn Mowers, etc.)

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Eric A. Jones


Lawnmower Repair . Certified Master Service Technician from B&S. Have 23 years experience on B&S, Lawn Chief, Weed Eater, Echo, Peerless, Wheel Horse, Snapper, Atlas, MTD, McCulloch, Homelite and many other numerous brands. Specialize in electrical repair.


Born and raised in the midwest. Started tinkering with engines when I was about 14 on my Suzuki RM-80. I began lawn mower repair at a small hardware store. I knew absolutely nothing. I read lots of repair manuals and met an older fellow who taught me many lessons. I continued working on small engines through high school and paid my way through college working on mowers at the same hardware store. Decided to get away from the midwest and mower repair so I joined the Air Force. I repaired air traffic control electronic equipment and ended up in Hawaii where I got a part time job at Small Engine Clinic. I gained a lot of experience from the Small Engine Clinic and had a blast repairing small engines. I then took the Briggs and Stratton Master Service Technician test and earned my MST. I then traveled to Wisconsin where I attended the factory update training seminar and received formal training. Continued working on mowers part time as I completed 20 years of military. Retired from the military on a Friday and continued in the lawn and garden industry the next Monday.

MAS Aerospace Operations BA Mathematics AAS Electronic Communications AAS Electronic Technology

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