On another note.... There is an E3 spark plug that works well in this motor which is MUCH shorter than the standard plug. Also, if you toss the cheap plastic spark plug boot that comes with the kit and replace it with a rubber automotive boot/wire, the rubber boot will flex and allow you to get it on the plug when it is much closer to the top tube than the stock plastic boot. Together with the small plug and the rubber boot you can fit the motor on a much smaller frame, I run a 16.5" Specialized mtn bike, it's a really small frame but it still fits...