HIFROM TM Carburetor for 43cc 49cc 2 Stroke Engine 15mm Intake Hole Atv Pocket Rocket Bikes Gas Scooters Mini Chopper Carb 1. 15mm intake hole 2. Fit for 43cc 49cc 2 stroke Engine Pocket Bikes, ATVs, Stand-up Scooters, Dirt Bikes, for most all China gas scooters & mini chopper. for most all China gas scooters & mini choper 3. Intake inside diameter: 15mm. 4. Mounting Hole distance: 30 mm center to center 5. Mounting Hole size: 5.5 mm approx.