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The engine produces 35 hp (26 kW). [1] The YZ125 has been built with five- or six-speed manual sequential gearbox depending on model year. The 2005 model has a constant-mesh, wet, multiple-disc coil-spring clutch. From 1973 through 2004, the YZ125 had a single backbone frame made from steel. It generally averaged from 176 to 198 lb (80 to 90 kg).
The engine using this system, running at 8500 rpm, takes a very considerable 46 crank degrees before any signal from the cylinder can reach the runner end (assuming no movement of the air in the runner). 46 degrees, during which nothing but the volume of the port/runner supplies the demands of the cylinder. This not only applies to the initial ...
The 2019 model has a new rear swingarm, changes to the frame and bodywork, a new engine with Variable Valve Actuation (VVA). [clarification needed] There is a small 2021 update, that adds a vapor canister to the fuel system, presumably to help the bike comply with the more strict Euro 5 emission standard.
The first bike manufactured by Yamaha was actually a copy of the German DKW RT 125; it had an air-cooled, two-stroke, single cylinder 125 cc engine [1] YC-1 (1956) was the second bike manufactured by Yamaha; it was a 175 cc single cylinder two-stroke. [1] YD-1 (1957) Yamaha began production of its first 250 cc, two-stroke twin, the YD1. [1]
Yamaha produced Formula One engines from 1989 to 1997 (with a one-year break in 1990), initially for the Zakspeed team, in 1991 for the Brabham BT60Y, in 1992 for the Jordan 192, from 1993 to 1996 for Tyrrell, and in 1997 for the Arrows A18. The Yamaha engines never won a race (Damon Hill nearly did so at the 1997 Hungarian Grand Prix).
Vintage engine testing equipment that can test ignition timing, ignition dwell, manifold vacuum and exhaust emissions. Engine tuning is the adjustment or modification of the internal combustion engine or Engine Control Unit (ECU) to yield optimal performance and increase the engine's power output, economy, or durability. These goals may be ...
Jet noise may be reduced by adding features to the exit of the nozzle which increase the surface area of the cylindrical jet. Commercial turbojets and early by-pass engines typically split the jet into multiple lobes. Modern high by-pass turbofans have triangular serrations, called chevrons, which protrude slightly into the propelling jet.
The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha Motor Corporation.It was the successor to the previous YZ426F which was discontinued in 2003. It is credited by Cycle World and Dirt Rider magazines as the bike that started the four-stroke dirt bike revolution.