Re: What am i into here?

[chris-p]

Yup sheared. Take the mag plate off. Should be able to get the remains of the key out then, and install new.

The key does not drive flywheel, the friction between the tapers does after torqueing to spec. The key simply aligns them, nothing else.

Should not be too bad a fix.

You likely did not have spark, since the flywheel had altered its orientation on the crank.