ENGLISH. Engine valves clearance must be checked especially if the engine is making a tapping sound at start up or later. Mortorcycle engines require regular valve clearance adjustments usually every 50k kilometres. Valve Adjustment Tool will help engin repair appressure and "Smooth". Size: 08 - 09 - 10MM suite almost engine four stroke 90cc - 150cc in market: HONDA YAMAHA KAWASAKI SUZUKI SYM BENELLI KYMCO Ect.