My Craftsman 917.270930 that looks like yours also has the clutch that will pop your neck also.
If in 4rh gear and up it will pull the front wheels off the ground If engine speed is at 1/2 throttle and up.
When I first got the really nice clean looking mower/tractor, seat look new, a Bubba had taken the really clean looking Briggs twin 461707 engine apart, reported to crank fast but not start. Both heads, magneto, carb off the engine and Bubba was trying to get the flywheel off when they gave up. At least Bubba had all the parts and pieces in a old ice chest.
He gave me the rig due to him being sick of the machine as barter for me repairing his air compressor.
I put the engine back together and it had a weak spark, $20 replacement magneto and ran like new. Starts really fast, like new. The carb even looked new. Mower had apparently been stored inside by the previous owner and had TLC, but Bubba was really inflicting pain on the rig and losing ground fast.
Installed the low hours deck after packing the spindle bearings and sharpening the blades and put to test as A ok, except the blade brakes not working.
The blade brakes are the wimpy type on this one, finally got them to braking.
I have not looked at the neck popping clutch. Drive belt looks new.
Was kinda hoping the motion drive belt would wear in for slippage but not yet.
All the safety Interlocks work as intended.
Probably place it for sale next year.