Yamaha YZ125

                              Yamaha 125

                                                                    10 x 10


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Yamaha YZ125


The Yamaha YZ125 is a motorcycle with a 124.9 cc two-stroke engine designed for motocross riding and produced by Yamaha Motor Company. It was first produced in 1974 and for the first year was made with dual rear shocks (Thermalflow shocks) and in 1975 released its first monoshock design the YZ125C and has continued production with a new model being produced every year to date. The YZ 125's produced from 1996 to 2002 are considered by some to be the best dirt bikes ever, due to its wide powerband and excellent handling.The YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.

In 2001, Yamaha released a bike designed to complement the YZ125, the four-stroke YZ250F. The two bikes share a rolling chassis and are eligible to compete in the same racing class.

Engine


The YZ 125 has had a liquid-cooled 124 cc, reed valve inducted, two-stroke engine since 1981. The models from 1974 to 1980 were air-cooled and also two-stroke. It breathes through a 38 mm TMX carburetor made by Mikuni. Stock, the engine produces 33 hp (25 kW) at the rear wheel.

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Transmission


The YZ125 has been built with five- or six-speed sequential gearboxes depending on model year. The 2005 model has a Constant mesh wet, multiple-disc coil spring clutch. The revised gear ratios as of the 2005 model are:
  • Gear Ratio - 1st Gear 31/13 (2.385)
  • Gear Ratio - 2nd Gear 29/15 (1.933)
  • Gear Ratio - 3rd Gear 27/17 (1.588)
  • Gear Ratio - 4th Gear 23/17 (1.353)
  • Gear Ratio - 5th Gear 24/20 (1.200)
  • Gear Ratio - 6th Gear 23/21 (1.095)

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