The process of engine break-in is alternately heating and cooling the engine to allow all parts to properly seat themselves, and allows 2-stroke oil from the incoming fuel to coat the interior of the engine. We recommend the following break-in procedure for your engine:
Use 91 octane or higher fuel, mixed 25:1 with a quality non-synthetic 2-stroke oil. (You can use synthetic oil for break-in as well but just be sure to run a little more fuel through the engine). Factory carb settings are 1 ¼ turns out for the low and 1 ½ turns out for the high. Prime engine until you see fuel coming into the tube. Use a short, quick pull on the pull start and avoid overextending. Run the engine at varying speeds for periods of 3 to 10 minutes at a time. During this break-in process, never go full throttle. Try to stay below half throttle. Always let the engine idle for 30 seconds before turning it off. Allow the engine to cool off for 10 minutes before starting it again. Repeat this process 3 or 4 times – 3 or 4 full “heat cycles”. After the break-in period, switch to a high-quality synthetic 2-stroke oil, mixed at 25:1. Be sure to let the engine idle for 30 seconds to cool before stopping.
Please see the instruction manual included with your dragster for further setup instructions.