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My youngest son pulls into my office a couple weeks ago, comes inside and says his engine started knocking about 5 miles from my office.
I told him to pull it around into the shop and I'd take a look at it after work. He started it and it was a little more than "knocking" so I told him to shut it off and I'd put it in with the a forklift.
A couple weeks go by and last night I finally pull the motor to open it up and see what went wrong.