My bike only has pipes, reeds, pods, timing plate set at +4, and i just shaved 35thousandths off my head to make it equal about 20 to 21cc and i can run 93 to 110 octane fine and its a great power gain go on ebay serach up banshee milled head and theres a guy on there where u tell him how much u want shaved off and he has new stock heads he shaves for u its 65$ great bang for the buck