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The original YZ250 of 1974 used an air-cooled 250cc two-stroke engine of 70 mm bore and a 64 mm stroke, which was improved semi-annually. The air-cooled motor was replaced in 1982 with a 249 cc liquid-cooled two-stroke reed-valved engine with a mechanical, rather than servo-driven, YPVS exhaust valve for a wider spread of power.
The Yamaha YZ250F is a motocross motorcycle first released in 2001 by Yamaha. It features a DOHC , four-stroke engine and initially had a steel frame and subframe in 2001–2002. In 2003 it received an aluminum subframe, which was replaced in the 2006 model with an all-aluminum frame.
The Yamaha YZ450F is a four-stroke racing motocross bike built by Yamaha ... Yamaha YZ250 2-stroke: Successor: YZ426F: Engine: ... Bore / stroke: 95 mm x 60.1 mm:
A range of add-ons are readily available from simple bolt on modifications and suspension parts to complete aftermarket frames and big bore kits to give more power to the engine. The heavily finned, air-cooled Blaster engine has roots from a water-cooled machine (Yamaha DT200), as evidenced by the plugged water pump casting on the right side of ...
The bore/stroke ratio changed to 56 mm × 50.7 mm (2.20 in × 2.00 in). In addition, the cylinders received a so-called Yamaha Power Valve System (YPVS). The first model series (TZ 250 A) of the water-cooled twin with contactless thyristor magneto ignition had a power output of 51 HP, the last expansion stage [ clarification needed ] , the TZ ...
The Yamaha YZ125 is a motocross racing motorcycle with a two-stroke 124.9 cc (7.62 cu in) displacement single-cylinder engine made by Yamaha since 1974. It is available to the public. For the first two years it was made with dual rear shocks, then changing to a monoshock. [3]
The Yamaha Zuma is an air-cooled 49 cc two-stroke scooter made by Yamaha Motor Company.It is also marketed as the Yamaha BWs, [2] and the MBK Booster.. The Zuma has a 14 mm Teikei carburetor with automatic choke, reed-valve induction, a fan-assisted cooling system, an autolube oil-injection system with an indicator light located on instrument panel which alerts rider when oil level gets low ...
The Roadking though, still retained the protuberance on the left engine cover that housed the oil pump in the Oilking. The Yezdi Roadking was based on the 1974 CZ 250 Falta, where the original bore and stroke of 70 mm × 64 mm (2.76 in × 2.52 in) was retained, but detuned for lower power than its Motocross original. The engine block is smaller ...
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