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It only has "Craftsman 12.5HP" on the hood. The only model number to be found is under the seat, 917.255572.

Either way then the swap should be straight forward then...yes? Thanks.:)

ILEGINE ,Thank you for the reply. :unsure: Unfortunately neither of these engines have any of those features. Both are electric start with a gravity fed fuel system.

I have 2 Briggs & Stratton 12.5 HP engines, model 286707-0437-01 (built -1992) & model 289707-0179-01 (built -1996). Other than the years of manufacture are there any real differences in these engines? I'm thinking of swapping the newer engine for the older engine because the newer engine...

Finally found an 11/16 external retaining ring at a somewhat local supply place. Looks much better than the 5/8. Hopefully get everything back together tonight. Thank you everyone for your help with this.

I split the case and took the axle out. The groove on the end appears to be in good shape. I put on a 5/8 external retaining ring. I think it's a little small. An 11/16 ring is tough to find. I checked tractor supply, Home Depot and my local hardware store. I think I'll order one and...

I picked up an older Craftsman II 12.hp 38-inch mower model #917.255572. Long story short I knocked the left axle out of the gearbox :ashamed:. It destroyed the retaining ring (Part #3656) on the shaft rendering it useless and they are no longer available from Sears. I used some JB weld to...