Originally Posted by scotto-
The actual proper method for break-in of a Chinese 2-stroke might be this:
Breaking-in an engine is a process of alternately heating and cooling the engine to allow all parts to properly seat themselves, and allowing 2-stroke oil from the incoming fuel to coat the interior of the engine. DDM recommends the following break-in procedure:
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 also. Just run slightly more fuel through the engine. ) Run the engine at varying speeds for periods of 3 to 10 minutes at a time. During this break-in time, NEVER go full 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. Be sure to follow the maintenance schedule included in your engine owners manual.
This is instruction given off of DDM's website for Chinese 2-strokes and I think it is sound advice....use at your own risk!
i don't trust those break in methods of DDM. Expecialy about using synthetic oils, heat cycling and never using full throttlle.
Break'in is about seating the rings right away while the crosshatch hone pattern is rough enough to seat the rings.
When rings are new, they don't seat their fil 360 deg circumference.
The rings need to be LOADED with full throttle,but not high rpm, to make them seat.
Itis well jnown in all other forums that synthetic oil will keep the rings from seating well., the stuff is just too slippery.
If the rings aren't seated good in the first 20 miles, they will always be leaky.
Did you read the article in the link in the first 2 posts above?. Well proven and 'splains it very well.
I think the DDM directions are just CYA advise just like all other "factory" reccomendations for easy break
in. They don't care about engine longivity or peak performance. They just don't want to chance novices toasting new engines.