... 4-stroke, OHV (overhead valve), single cylinder, air-cooled engine. Neat and economical for classical design.Advanced AVR offers over- ... Frame designed for better protection.Oil alert system with automatic engine shut-off.YAMAHA 4-stroke, OHV (overhead valve), ... single cylinder, air-cooled engine. Cast iron cylinder liningHydraulic-Magnetic circuit breaker.15L fuel tank ...