with your mods running race gas will hurt you more then helping... you simply do not have the compression to run it. you will be able to get off running 91-97 oct with no problems. also there is no need to buy motul.... your spending extra money for a name... just run Yamalube R2 if you ask around lots of peeps run it including myself , its a very good and inexpensive oil. youd be suprised how many shee owners run it.