The very front where the engine is mounted. This occurred during a startup where the engine is starting from zero rotations to 1,000 rpm. Maximum torque with major engine imbalance with only one cylinder firing before the second one catches.

This motor, for a 2012 frame, is way over powered to what the frame could take. The new frame looks very good with the added gussets and bracing.

I never want to experience that again...

What's your mileage? Who cares. Is it practical? See #1. What happens when it rains? You get wet.