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 »

Dear ATVC: I have a 1988 Kawasaki Mojave 250. When I set it on timing and try to kick it over, both intake and exhaust valves open when piston is returning to TDC. I’ve got it in a trade so I can’t really tell you the history behind it but all I know is that […] More »

Sometimes logic has no place in the rough and tumble conditions of a modern ATV engine operating at full tilt. Logic would suggest that as your engine’s valves open and close millions of times, they would slacken up, become loose and sloppy. However, the truth of the matter is that often valve clearances actually become […] 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 »

Dear ATVC: My quad’s rear shock feels really springy- it still seems to be working but the rear of the machine bounces more than I remember over rough terrain. My friend says it means the shock is blown and needs to be rebuilt. I thought a blown shock wouldn’t work at all. Please help. Sadly […] More »