I finished putting a 66cc skyhawk engine on my huffy beachcruiser yesterday. It has the fat 2.3 inch tires, and the standard bicycle chain for the motor rubs on the back tire. I am upgrading to the heavier chain. Is there any way that I could get the chain to not hit the tire? If not, then I am going to buy a thinner back tire. Any help will be appreciated! Thanks!