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2. Four-stroke power valve system - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_power_valve_system

   A four-stroke power valve is a device fitted to four-stroke engines that constantly adjusts the internal diameter of the exhaust system to better suit the speed of the engine. Yamaha was the first to develop such a system, called the Exhaust Ultimate Power Valve (EXUP). [1] It first appeared on the Yamaha FZR EXUP and was later used on many ...

3. Yamaha RZ350 - Wikipedia

   en.wikipedia.org/wiki/Yamaha_Rz350

   The YPVS could open and close the valve to move the height of the exhaust port and thus affect the exhaust port timing. This provided lower RPM torque while retaining high RPM power. The interchangeability of many of the major engine components with the Yamaha Banshee ATV has allowed strong aftermarket support for the RZ350.

4. Honda TRX250R - Wikipedia

   en.wikipedia.org/wiki/Honda_TRX250R

   The Honda TRX250R was a sport ATV manufactured by Honda between 1986 and 1989. It combined a lightweight frame and good handling with a liquid-cooled two-stroke engine and six-speed close-ratio transmission.

5. Four-stroke engine - Wikipedia

   en.wikipedia.org/wiki/Four-stroke_engine

   Four-stroke cycle used in gasoline/petrol engines: intake (1), compression (2), power (3), and exhaust (4). The right blue side is the intake port and the left brown side is the exhaust port. The cylinder wall is a thin sleeve surrounding the piston head which creates a space for the combustion of fuel and the genesis of mechanical energy.

6. Suzuki LT250R - Wikipedia

   en.wikipedia.org/wiki/Suzuki_LT250R

   The Suzuki LT250R was a sport/racing ATV manufactured between 1985 and 1992. [1] It combined a lightweight fully suspended frame with a 249cc liquid cooled two stroke engine. Nicknamed by Suzuki as the QuadRacer, it revolutionized the (ATV industry). [2] Before this model was released, the ATV racing world was dominated by three-wheelers.

7. Polaris RZR - Wikipedia

   en.wikipedia.org/wiki/Polaris_RZR

   2022 Polaris RZR Pro R Ultimate 4-Seater. The Polaris RZR (Often pronounced as POLARIS RAZOR), is a sport side-by-side produced by Polaris Industries.When launched in 2007 as a 2008 model, it was officially known as the Ranger RZR, as it was marketed as a sub-model of the larger, work-oriented Ranger.