You might also have issues with the first chain & chain guard hitting the side of the engine, unless you mount it up high.
You will probably need a extra long chain too.
Look at onesikschwinn's first black bike... look at how he offset his engine to the left side. That might solve all these problems & work well on this bike for mounting your engine behind the cranks & clearing your tire & chain! (if you pedal clears the side of the engine.)
