2-stroke 66cc/80cc motorized bike Monster Exhaust Expansion Chamber Power Pipe. Monster Black Expansion Chamber Muffler-2 Stroke Engine Gas Motorized Bicycle. 66cc/80cc RUNFAST TM muffler Black - 2 stroke gas motor engine kit- Gas Motorized Bicycle.
RUNFAST NASTY JACK muffler fitting on 2 stroke gas motor engine kit gas motorized bicycle. RUNFAST NASTY JACK muffler fit on well on most cylinder heads including CNC head. Black color with better performance and cool shape.Size of Air Outlet: 0.984 inch outside diameter and 0.886 inch inner diameter. HIGH COMPRESSION MONSTER CNC HAMBURGER HEAD POWER PLUS PERFORMANCE.