Honestly, build one using the tutorials available online. I put off building one for so long, and almost bought the 80 dollar motionpro. Eventually one weekend i was at home depot and just said fuck it, and bought everything. Cost like 10 bucks in parts, and 20 dollars for the motionpro adaptors that i used, because my carbs had a weird vacuum adaptor. Took literally about.... i think 10 minutes to put together and then a hour of waiting to get all the bubbles out of the 2 stroke oil. Its better than the mecury sync tools i find, its a lot more accurate and its easier to read if you build it on a yard stick.