engine sounds terrible

[Scarpulla, Christopher [IT]]

Have you checked your oil level lately? Take a corner hard, with your oil
lever 1 1/2 quarts low, and it'll happen. Can you duplicate the sound by
just lightly tipping in the throttle? If so, you may have spun a bearing.
You can confirm it by pulling one spark plug wire at a time and gently
revving the motor. Pull a plug wire, rev, replace the wire, move to the next
cylinder etc.

Chris