70 hp force broken keyway

[Paul fun fish]

The keyway has sheared and was wondering if any
Other damage could have happened .i know it has
no valves but ? Also what caused this ?carb issue ?/
timeing ? Fuel is fresh and mixed correct or is it
possible we did not tighten the flywheel nut correctly when new
Stator was installed

 

[Nordin]

If the key has shared the most possible issue is that the nut was not tighten to right torque value.
Another possble thing is a back fire.

Clean the grove in the crank taper and lap the taper with valve grinding compound such as Carborundum.
Install a new key and torque the nut to spec. value.

 

[jerryjerry05]

85# is what I believe they suggest.

Also nothing can cause the key to shear??
​New boat.1988
Went out one day shortly after getting the boat.
Fished and tried to start the second motor.NOPE!!
Luckily we had 2 .
​Found the key sheared, didn't backfire, didn't hit anything ??
Just sheared??
Follow Nordins suggestions.
Check the inside taper on the flywheel for damage.