Fitment: This 420 carburetor kit is compatible with mini bike go kart lawnmower water pump pressure washer with Predator 301cc 8hp, 420cc 13hp, GX240 8hp, GX270 9hp, GX390 13hp engine, Brig* 1450 305cc engine Improve Power Performanc*: It takes a larger dose of the air mix to run the larger engine at peak performanc*. Our PZ30 carburetor air filte* kit is designed to improve the performanc* and power by delivering a precise mixture of fuel and air to the engine, resulting in stable idle speed, smoother power output and air flow, better acceleration and throttle response Improved 420cc Exhaust Muffler: The improved silencer and exhaust use excellent welding technology to make the mini bike exhaust muffler more solid, solving the problem of silencer breakage during the ride to a great extent Package Includes: 1 * PZ30 carburetor, 1 * exhaust header pipe, 1 * muffler, 1 * 42mm air filter, 1 * intake manifold, 1 * 12mm air filter, 1 * fuel filter, 3 * gaskets, 1 * fuel line, 6 * clamps, 3 * wrenches, 6 * screws, 4 * ties, 1 * heat shield tape