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This is the Tecumseh starter gear tool set (part number 670346) I use to expand and remove the retaining clip without mangling it. It makes the job faster and keeps the clip reusable, which is exactly what you want when you’re doing a starter gear swap. You can fight it with regular pliers, but this set saves a lot of time.
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“I've got a snowblower in here with a Tecumpsa engine”
“Okay, here it is on an MTD snowblower to come engine here”
“Now, before you take anything apart here, what you want to do is go under the starter and tighten up the two bolts right there”
“On this machine here, you can replace the starter gear”
“Now, once you get the screws off, the starter will just slide down from shoulder bolts that are on top here”