Small Engine Troubleshooting Problems? Ask a Mechanic Now.
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Please click on the links below, I have attached for you. The first link, is for a set of Tecumseh model numbers for a 3.5 hp engine used on Ariens ST350. The second link is for a free service manual for your engine.
Tecumseh Parts List - Click Here
Tecumseh Service manual - Click Here
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On Tecumseh engines, the model numbers are usually stamped in your metal rope pulley housing assembly. The numbers can be on the sides of this housing, or near where your spark plug wire comes out.
If you like, I can attach a link to an Ariens manual.