Tecumseh 6.25 hp on MTD lawnmower won't start?

My Lawn Mower is doing the exact same thing. I have inspected the flywheel and it looks quite normal......What I think is causing my adapter to break is the the blade maybe out of balance....I'm going to try a new blade and see if that will work. I balanced the blade on a screwdriver and it was

over 7 Adapters broken
October 2008

On a rotary mower, the 'flywheel' is misnamed - it's not much more than a place to mount the mangneto magnets. The real flywheel is the blade - so the short answer is - yes - this is normal behaviour for a rotary mower engine with no blade. That does NOT mean, however, that the flywheel key isn't sheared - you still need to check it.

The blade adaptor is solid alloy. It is impossible for this to break unless the blade is subjected to a heavy impact - at which point it is SUPPOSED to break to protect the crankshaft.

Phil Saunders
September 2008