38MM TMX REPLACEMENT CARBURETOR – 2-STROKE PERFORMANCE REPLACEMENT. This 38mm flat-slide TMX replacement carburetor is designed as an affordable replacement option for many 125cc and 250cc 2-stroke motorcycles originally equipped with a similar 38mm carburetor. Each carburetor comes with a baseline jetting setup of a #410 main jet and #40 pilot jet, providing a solid starting point for most applications. Final jetting should always be adjusted for your specific engine, exhaust, intake, elevation, temperature, and fuel. Venturi / Bore: 38mm. Engine-Side Spigot OD: Approx. Airbox-Side Inlet OD: Approx. Designed to accept commonly available TM/TMX-style replacement jets. RM250: Select applications using compatible 38mm carburetor dimensions. YZ250: Select applications using compatible 38mm carburetor dimensions. WR125: Select 38mm applications. Some later-model motorcycles were originally equipped with a Throttle Position Sensor (TPS) on the factory carburetor. This replacement carburetor does not use a TPS. For applicable models, the motorcycle’s TPS electrical connector can be left unplugged and securely protected from dirt and moisture. This carburetor operates mechanically and does not require the TPS connection. This is a replacement carburetor and is not an OEM component. Please compare the listed dimensions with your original carburetor before ordering. Depending on the year and model, minor installation adjustments may be necessary. Some intake or airbox boots can be tight due to small differences in outside diameter. Gently warming the rubber boot can make installation easier. Throttle cable routing and adjustment should also be checked during installation. The installed #410 main and #40 pilot are intended as a baseline only. Carburetor jetting varies depending on exhaust system, air filter and airbox modifications, engine modifications, fuel/oil mixture, temperature, humidity, and elevation. Always verify jetting for your individual engine before extended or high-RPM operation. 1 x 38mm flat-slide replacement carburetor. #410 main jet installed. #40 pilot jet installed.
