Johnston Synthetics

  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...

  Different equipment manufacturers recommend different two-stroke oil mix ratios. Two-stroke engines derive lubrication from the oil mixed directly into the gasoline, unlike your car engine, which lubricates itself with oil housed in an oil sump and circulated by an oil pump. Read more about the  differences between two- and four-stroke engines . Untangling different mix ratio recommendations and mixing multiple containers of fuel is a hassle, particularly for professionals who run several different pieces of equipment. What if there was one solution for different two-stroke oil mix ratios that worked in all your equipment? Oil mix ratios explained If your manufacturer recommends a 50:1 fuel/oil mix, it means you need 50 parts of gas to one part  two-stroke oil . To mix one gallon of fuel at 50:1, add 2.6 ounces of two-stroke oil to one gallon of gas, as shown in the chart below. Don’t worry, we’re going to eliminate the need for a metric chart shortly. Different mix rat...

Motorcyclists expect their bikes to perform flawlessly in all kinds of operating conditions. Whether it’s used for urban mobility, commuting to work, cruising the backroads or touring the country, reliability is paramount. In conditions like these, your bike can generate extreme heat and undergo stress that can lead to oil consumption and engine and transmission wear. Find out how AMSOIL  Synthetic Metric Motorcycle Oil  stands up to an 8,000-mile torture test! To demonstrate the performance of AMSOIL  Synthetic Metric Motorcycle Oil , it was installed in a high-performance 890cc Yamaha* MT-09.* The bike was rolled onto the dyno and subjected to test conditions designed to generate extreme heat and engine stress. The bike endured a torture cycle of 8,000 miles of simulated heavy traffic under load. During the test, the oil temperature hit 200°F. The oil was analyzed at the end of the test, and the engine and transmission were disassembled. AMSOIL  Synthetic Metric Mo...