Not so fast... Many times, engine failures are due to improper jetting. Upon completion of the job, we can provide you with jetting RECOMMENDATIONS. Final jetting is ALWAYS the responsibility of the customer, unless the machine is brought in for jetting here at our location. We will not be held responsible for a failed engine due to improper jetting, or other factors that are out of our control. There are also other determining factors in the life of the engine, most of which we cannot account for when doing a simple engine rebuild. You will need to make sure your intake system is free of leaks (intake boot, air-box, and filter assembly) and that your carburetor is clean. You will also be responsible to determine that your cooling system is functioning properly, and that you maintain the correct oil level in the engine, as all engines are shipped dry.