I have a skyhawk frame coming in and plan to throw my 66cc Flying Horse motor on it. What I want to know is, do I need to bother throwing a chain tensioner near the rear sprocket? Or is there already enough tension? Additionally, the kit I received had a sprocket holder that clamped on each sides of the spokes of the rear wheel. Should I upgrade this and if so what do I use? I want to get the fastest speed possible so I am also wondering if I should use a single speed crank or an 8 speed. How many teeth should the rear wheel sprocket have for this type engine? I need help!