Protect your fuel system and ensure a stable idle with the Universal Parts Carburetor Insulator. Specifically designed for the 50cc 4-stroke QMB139 (GY50) engine platform, this high-density plastic spacer sits between the intake manifold and the cylinder head. Its primary function is to act as a thermal barrier, preventing extreme engine heat from reaching the carburetor, which can cause fuel boiling, "vapor lock," and inconsistent performance.
This insulator is a standard replacement part for the 50cc 4-Stroke (QMB139/GY6 50) engine found in:
Mechanic's Note: If your scooter runs great when cold but starts stumbling or dying once the engine gets hot, this insulator may be cracked or missing. Pro Tip: This insulator requires a Paper Gasket on both sides to create a true vacuum seal. Always check your Intake Manifold for cracks while you have this assembly apart.
SKU: 151-7 Vendor: Universal Parts
