| Break-in oil is less "slick" than synthetic oil which serves to let the rings wear down just enough to conform to the cylinder. This is almost unnecessary with some bike brands now that do a really good job of making the cylinder nearly perfectly round. But I would do it any way just to be sure. 
Proper Break In Using petroleum oil, not too thick, is good and then after break in use semi-synthetic to not smoke much and get great wear protection. There are oils specifically designed for break in with less dry lubricant additives, and you can also use oils that are 100% "mineral oil", without synthetic oil, and my recommended ratio of use for break-in without prolonged hi RPM runs is 33/1 ; Amalie SynPlus Oil 20W-20, Bel-Ray Mineral 2-Stroke Oil, Yamalube 2R. Good semi-synthetic oils to consider after break-in : Motul 510 2T (35:1), Motul 710 2T (42:1) Full synthetic oil: Motul 800 Off Road (50/1). To read more about the details of these oils and what other oils are available just go to www.dragonfly75.com/moto/oil.html Ratios for break-in are higher than normal (for less oil) and all ratios are based upon my computer program that calculates ratios based on type engine cooling, and max RPM. I prefer semi-synthetic oils because the non-synthetic oils have some properties that the synthetic oils don't have. Of course if you are after the most smokeless oil possible then buy one that is 100% synthetic. My general suggestion for break-in is just to ride it easy, not too fast, for the first half tank of gas. Continue to use up the gas/oil mix in the tank and then switch to a semi-synthetic or full synthetic oil at the ratios I recommend above. |