Engine Control Unit. Dear ATVC: I have 2005 Suzuki King Quad 700. My question is how reliable is the Copperhead ECU? My factory ECU has gone out and need to get a new unit. CannonBall700 The Copperhead ECU comes from Velocity Devices Inc. and in our experience, the reliability will be equal to what you […] More »

We’d begin looking here for answers. Dear ATVC: I have a Linhai Rustler 260. Everything works perfectly until the engine gets hot and then it starts to misfire and eventually cuts out. I have changed the spark plug, coil and CDI. I set the valve gap and serviced the carb. But nothing seems to work. […] More »

Who among us hasn’t heard the bark of a well-tuned repli-racer street bike and thought I wonder how all that power would feel in my ATV? The beauty of the internet is it allows us to experience precisely such sensations from the comfort of our desk. Here’s what 170HP and a top speed of 125-miles-per-hour […] More »

In this day of four-stroke domination, many riders will never have had the experience of wringing out a high-revving two-stroke quad. This is a shame because two-strokes created a type of power delivery that even the peppiest four has difficulty reproducing. Best of all it managed to do it by weighing less, containing far fewer […] More »