Castrol POWER1 XR 77 is an oil specifically developed for pre-mix use in racing 2-stroke motorcycle and kart engines. It is not suitable for normal driving on roads.

Advantages

High lubricity formulation to prevent seizure in high-speed conditions - allows tuners to lean out their engines to a maximum
Provides sustained engine power throughout the race.
Visible spark plug and piston crown deposits to enable fine race tuning - high levels of deposits and good tones giving excellent readability on all unleaded fuels.
Wet weather throttle lubrication - Castrol POWER1 XR 77 is formulated to prevent throttle slide sticking during wet conditions.
Ease of mixing with racing gasoline - and minimal effect on the octane rating of high performance fuels allowing maximum engine compression.