• Castrol XR77 Is the ultimate pre-mix racing 2-stroke engine oil based on fully synthetic technology.

Castrol XR77 Is the ultimate pre-mix racing 2-stroke engine oil based on fully synthetic technology. Since the unveiling of Castrol A747 in 1976 there have been numerous technical developments in the field of Grand Prix Road Racing and competition engine power has risen from 300 bhp/litre to over 400 bhp/litre. Engine design now also allows for the use of unleaded fuels without significant performance drop despite unleaded fuel having different composition and properties than other fuels. Specifications: Fully certified for use in Moto GP racing EMPA test report number 417478/01 Benefits: High lubricity to prevent seizure in over-speed conditions- allows tuners to lean out their engines to a maximum Sustained engine power throughout the race Visible sparkplug and piston crown deposits for fine race tuning - high levels of deposits and good tones giving excellent readability on all unleaded fuels Wet weather throttle lubrication - XR77 is formulated to prevent throttle slide sticking in wet conditions Ease of mixing with racing gasoline - and minimal effect on the octane rating of high performance fuels allowing maximisation of engine compression