Hi, I recently had the same thing happen with one bolt on the balancer. I retapped the hole and replaced the bolt. The bike wouldn't fire. I took the balancer off and saw the the key had sheared off smooth. Any ideas as to why this may have happened? Also posted some pics of it's life to help visualize.
2 Suzuki GZ250.jpg
4 Stripped (2).jpg
10 Green glow.jpg
0209141338.jpg
0216141849.jpg