I actually ordered the motor from Jegs.. the first engine they sent me I got about 5000 miles out of before it broke down and destroyed piston #1. I got a warranty motor back and I\'ve driven it for about 30 miles and I\'m pretty sure this one is toast too. The best way to describe the noise is if you set the choke improperly and the engine doesn\'t have enough air to function. The last time it started to fail I checked the water temp/ oil pressure and both were normal (200 degrees/60psi)... :^/