This CDI is a no speed limit (no rev limiter) type and its designed to fire large displacement single cylinder engines, 125cc-250cc and larger. It has automatic timing adjust capability that quickly adjusts to any timing situation or timing setup an engine uses. Comes in a handsome aluminum casing (available in colors). Designed for all out power, effectively increases rpm power and torque past 10,000 plus. And an increase in throttle response is evident with this unit.