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Does anyone know what the exact governed speed is of the Tecumseh 4-cycle engine that is used on the 1962 model Toro Whirlwind 19" and 21" walk-behind mowers?

Model numbers:
18111, 18113 - 19" hand push mower
18121, 18123 - 21" hand push mower
20121, 20123 - 21" Pow-R Drive (self propelled) mower

Sometimes, in the specifications, the ground speed in mph may be given with the engine at both its minimum and maximum speeds. Minimum: 2.5 MPH at 2500 RPM; maximum: 3.75 MPH at 3750 RPM.

Not a video of a Toro mower, but, imagine your 1962 Whirlwind as having its engine sound like this '90s Craftsman lawn vacuum (but, without that higher pitched drone overtone):
http://www.youtube.com/watch?v=kZYujLaJKhc

Thank you,



Ben
 

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Thread bump: Being 1962 models, these Toros were the last year in which the engines used on them assumed the old-style Lauson model and serial #s (Tecumseh took over that company in 1956, followed by Power Products--the original manufacturer of the Tecumseh 2-cycle engines--the next year, 1957). Later in 1962 (1963 model year), Tecumseh assumed the new-style model and serial number ID's (with the Julian date code).

~Ben
 

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my uncle is an old small engine mechanic. I have a 1969 and 1971 toro whirlwind with a Tecumseh lav30 and lav35. top rpm is 3600 rpm. I use a vibration tachometer and set mine at 3500 rpm since being so old. I just rebuilt my grandfathers that I still use. toro restored.jpg
 
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