.12 Rear Exhaust 3 Port Short Stroke Plus Race Slide Carb SG Crank Turbo Plug Code PLUS12-3ST Maximum power 1.64 hp R.P.M 42.200 rpm Practical Range 6.000/43.000 rpm Bore/Stroke 13.70mm/14.25mm Ports 3 Crankshaft 11.90mm - TURBO SG Glow Plug Type TURBO Exhaust Type Rear