Johnston Synthetics

  Modern motorcycle engines are highly refined and benefit from specifically engineered lubrication. For example, engines that spin up to 10,000 rpm or higher can cause oil to foam, reducing its ability to protect engine components. Motorcycle oils usually serve dual purpose as clutch lubrication and the shearing transmission forces can also reduce an oil’s lubricating ability, leading to notchy shifting. Additionally, touring and adventure bikes are built for long, cross-country trips that benefit from extended drain intervals. And the increased heat generated by compact, high-performance engines can rapidly accelerate oil breakdown, leading to deposit formation that robs motorcycle engines of efficiency and power. Protection and Performance The advanced technology in  AMSOIL Synthetic Metric Motorcycle Oil  is specifically engineered to deliver maximum performance to prevent oil breakdown under extreme heat and pressure. It promotes smooth, consistent shifting and prote...

  Restore your lost engine power. All engines draw air into the cylinder for combustion and expel the spent gases through an exhaust system. Exhaust power valves improve two-stroke engine performance by managing exhaust-port timing to maintain optimal throttle response and power delivery at any engine speed. Power valve inserted in the right exhaust port. Why exhaust power valves matter. all exhaust ports increase air velocity, which translates into improved power and throttle response at low rpm. However, small ports cannot move enough air as engine speeds increase, leading to reduced high-rpm performance. In other words, a narrow exhaust port will be more powerful launching the machine from a stop but lack top-end power. Large exhaust ports create the opposite effect, reducing low-rpm air velocity, throttle response and power, but increasing top-end power. To solve this problem, engineers designed variable valves for two-stroke exhaust ports that change size relative to operating...