Ariens 901005 Tiller
H50-653971
The original engine has two shafts on it. The shafts sizes are 3/4" x 2-5/16" and the pto to run reverse is 5/8" x 1". This series of Tecumseh engine is no longer available. If you are willing to give up reverse on your tiller the OHV engines listed here would work for you.
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