Senda engines vibrate like magnitude 8 earthquakes.
Shit's hit the fan triple times within a month.
Medium strength threadlocker isn't sufficient on its own.
Use wedge-locking washers on timing plate and magneto screws.
Also use wedge-locking washers on exhaust manifold, engine mounts, front sprocket, front caliper bracket screws.
Use a cast iron cylinder for its vibration-damping properties.