T4T4 is designed for stock or slightly modified 4 stroke engines. Unleaded and ethanol free T4 is a direct pour in replacement for premium pump fuel which has a short storage life and has caused a heightened need for repairs in all engines after periods of non use. While riders facing extreme conditions are forced to add octane boosters or race fuel to increase the octane of pump fuel T4s 103. 5 octane rating provides greater protection against