2-Stroke Motorcycle Oils

AMSOIL Synthetic 2-Stroke Motorcycle Oil

Two-stroke motorcycle engines have fundamentally different lubrication requirements from four-stroke engines. Rather than continuously circulating engine oil through a sump, two-stroke applications introduce lubricant into the engine through the fuel or a separate oil-injection system, where it must protect critical components before being consumed during combustion.

Protection Without Excessive Deposits

A two-stroke oil must provide dependable lubrication to pistons, rings, bearings and other critical components while also burning cleanly. Deposit formation can affect piston rings, combustion chambers and exhaust systems, making cleanliness an important part of two-stroke lubricant performance alongside wear protection.

AMSOIL synthetic 2-stroke motorcycle oils are formulated for demanding motorcycle applications, providing strong lubricating protection while helping control deposits and maintain clean engine performance.

JASO FB, FC and FD Two-Stroke Standards

Two-stroke oils use a different JASO classification system from the MA, MA1, MA2 and MB ratings found on four-stroke motorcycle oils. JASO two-stroke classifications include FB, FC and FD, with requirements addressing characteristics such as lubricity, cleanliness, smoke and exhaust-system performance.

Our JASO Motorcycle Oil Standards Guide explains both systems and the important distinction between four-stroke JASO friction classifications and two-stroke lubricant performance ratings.

Premix and Oil-Injection Applications

Two-stroke motorcycles may use premixed fuel and oil or an oil-injection system, depending on the engine and application. Always follow the engine manufacturer's lubrication method, required oil specification and recommended premix ratio where applicable rather than assuming one mixture is appropriate for every two-stroke engine.

Use the AMSOIL Vehicle Product Finder to identify suitable AMSOIL lubricants for compatible two-stroke motorcycle applications.