What should compression be in ATV engine?

The ideal compression ratio for an ATV engine typically ranges between 8:1 and 12:1, depending on the engine type and intended use. Higher compression ratiOS can improve power output and efficiency but may require higher-octane fuel to prevent knocking. It's essential to consult the manufacturer's specifications for the specific ATV model to ensure optimal performance and longevity. Proper tuning and maintenance also play a crucial role in achieving the desired compression and overall engine health.