you can buy synthetic/castor oil blends. i blend my own, about 50/50 with the honda synthetic 2-stroke and the maxima927 castor, both available at local motorcycle shops. i read somewhere that as the castor burned up it was still a dry lubricant, espesialy at extreme tempuratures such as in the ht motors. i dont know maybe i just like the smell of burning castor too. HEY!! DO A WHEELIE! hill climber