you should use a fully synthetic oil like Motul 600 ester base or any sythetic oils. These oils helps the engine run smoothly on high revs and the most important part less carbon on your engine and pipe. It may cost a little extra but it can save you a lot in the future, remember to drain the remaining mineral oil before you top up with new snthetic oil. On your manual try to search for speedfight hayne's manual, got a lot of info for your bike.
doc scoot cha, September 2007