Knocking noise while mowing.
I just got a Toro 20331 mower that's giving off a really back knock/banging noise when mowing. The mower sounds perfect when just idling but once I move to the grass it starts knocking and if I don't pull it back it will choke out and die.
I've read through all the posts and it sounded like it would be a bent/damaged blade so I replaced it (torqued to 50 ft/lbs) but that didn't help. Yesterday I tore off the flywheel because a friend told me to check the flywheel key but it's in perfect condition also.
I'm not afraid of tearing into motors (although I've never worked on a small motor before) but not sure exactly where to start or whether this issue is something that can be solved without major repair work.
It's a Toro 20331
Briggs and Stratton 6.5 hp motor
Build date 9/10
Appreciate any tips on where to start here.
Serial number 1009105686271