Yamaha YZ125

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 YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.[4]

YZ125
ManufacturerYamaha
ProductionSince 1974
ClassMotocross
Engine124 cc (7.6 cu in) reed valve two-stroke single
Power34 hp (25 kW)[1]
Transmission5- or 6-speed sequential manual
SuspensionMono-shock, 13 inches travel
BrakesHydraulic disk
Tiresfront 80/100-21-51M, rear 100/90-19-57M
Wheelbase1,440 mm (56.8 in)
DimensionsL: 2,140 mm (84.1 in)
W: 830 mm (32.6 in)
H: 1,320 mm (51.8 in)
Seat height1,000 mm (39.3 in)
Weight86 kg (190 lb) (dry)
94 kg (208 lb)[2] (wet)
Fuel capacity7.9 l; 1.7 imp gal (2.1 US gal)
RelatedYamaha YZ250F

In 2001, Yamaha released a bike designed to complement the YZ125, the four-stroke YZ250F. The two bikes shared a rolling chassis and are eligible to compete in the same racing class. The YZ250F has a slight horsepower advantage.[5]


The YZ125 has a 124 cc (7.6 cu in) reed valve-inducted two-stroke engine. It was air cooled from 1974 to 1980, and liquid cooled since 1981. It has a Mikuni 38 mm TMX series carburetor.[6] The engine produces 34 hp (25 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). For the 2005 year, Yamaha switched to a single backbone frame constructed from an aluminum alloy. This frame material change dropped the dry weight to 190 lb (86 kg). For 2008 models, the wheel assemblies and front fork suspension were redesigned, yielding additional weight savings, making wet weight, no gas sub-200 lb. Aluminum-framed YZ125s are notably "flickable" and sometimes this trait is seen as a drawback since they tend to become more difficult to control on rough surfaces.[2] The YZ125 used a conventional telescopic fork tube through 1988, then in 1989, added the first upside-down fork. A very well knows the amount of riders have chosen this as their go-to bike, such as AMA Champ Dom Barbuto and his brother Nick Barbuto, and X-Games medalist Kyle Ford. Also, 11-time Nationals winner and rival of Eli Tomac, Richard Rich

References
  1. "Two-Stroke Shootout: KTM 125SX Vs. YAMAHA YZ125". Motocross Action Magazine. 19 November 2016. Retrieved 6 May 2019.
  2. 2010 YZ125 Specs, Yamaha Motor Corporation, USA, archived from the original on 2009-11-25, retrieved 2009-12-05
  3. "MXA's 20 Most Frequently Asked Questions". MotoCross Action Magazine. Archived from the original on 27 February 2010. Retrieved 6 May 2019.
  4. "EVERY CHAMP | Motocross Action". Archived from the original on 2012-09-05. Retrieved 2007-05-09.
  5. "10 Things You Might Not Know About The YZ125". Dirt Bike Magazine. Retrieved 6 May 2019.
  6. "2016 YAMAHA YZ125 Two-Stroke Race Test: Everything You Need To Know". MotoCross Action Magazine. 18 April 2016. Retrieved 6 May 2019.
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