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'{{disputed|date=December 2014}} {{Infobox Motorcycle | name = YZ125 | image = Yamaha YZ125 Motorcycle.jpg | manufacturer = [[Yamaha Motor Company|Yamaha]] | parent_company = | production = 1974&ndash;Present | predecessor = | successor = | class = [[Motocross]] | engine = {{convert|124|cc|cuin|abbr=on}} [[single-cylinder]], [[2 stroke]], [[Reed valve#Two-stroke engines|reed valve inducted]] | power = {{convert|33|hp|kW|abbr=on}}<ref name=jday/>{{dead link|date=December 2014}} | torque =18.3 ft/lbs | '''transmission''' = 5 or 6-speed | suspension = Mono-shock, 13 inches travel | brakes = Hydraulic disk | tires = front 80/100-21-51M, rear 100/90-19-57M | top speed = {{convert|120|mph|kph|abbr=on}} | rake_trail = | wheelbase = {{convert|56.8|in|cm|abbr=on}} | length= {{convert|84.1|in|cm|abbr=on}} | width= {{convert|32.6|in|cm|abbr=on}} | height= {{convert|51.8|in|cm|abbr=on}} | seat_height = {{convert|39.3|in|cm|abbr=on}} | dry_weight = {{convert|190|lb|kg|abbr=on}} | wet_weight = {{convert|208|lb|kg|abbr=on}}<ref name=2010specs>{{citation |url=http://www.yamaha-motor.com/sport/products/modelspecs/31/0/specs.aspx |publisher=Yamaha Motor Corporation, USA |title=2010 YZ125 Specs |accessdate=2009-12-05 }}</ref> | fuel_capacity = {{convert|2.1|usgal|l|abbr=on}} | related = [[Yamaha YZ250F]] }} The '''Yamaha YZ125''' is a [[motorcycle]] with a 124.9&nbsp;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.<ref>[http://www.motocrossactionmag.com/me2/dirsect.asp?sid=F42B9D67B8404E24AA0EF9B32A75BA62&nm=FAQ%27S FAQ'S | Motocross Action<!-- Bot generated title -->]</ref> The YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.<ref>[http://www.motocrossactionmag.com/me2/dirsect.asp?sid=9945527E1D6A4953ACE23BB700C838FF&nm=EVERY+CHAMP EVERY CHAMP | Motocross Action<!-- Bot generated title -->]</ref> 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&nbsp;cc, [[Reed valve#Two-stroke engines|reed valve inducted]], [[two-stroke engine]] since 1982. The models from 1974 to 1981 were air-cooled and also two-stroke. It breathes through a 38&nbsp;mm TMX [[carburetor]] made by [[Mikuni (company)|Mikuni]]. Stock, the engine produces {{convert|33|hp|abbr=on}} at the rear wheel.<ref name=jday>{{cite web | url= http://www.dirtrider.com/reviews/164_0402_jday/index.html | title= 2004 125cc-class Shootout - Judgement Day |date=February 2009 | work= Dirt Rider | first= Scott | last= Hoffman | accessdate= 14 August 2011}}</ref> ==Transmission== The YZ125 has been built with five- or six-speed [[sequential gearbox]]es 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) ==Frame== From 1974 through 2004, the YZ 125 had a single backbone frame made from steel. It generally averaged from {{convert|176|to|198|lb|abbr=on}}. For the 2005 year, however, Yamaha switched to a single backbone frame constructed from an aluminum alloy. This frame material change dropped the weight to 190&nbsp;lb.(dry weight) For 2008 models, additional weight savings in the wheel assemblies and front fork suspension have yielded additional weight savings making wet weight, no gas sub-200&nbsp;lb. Aluminum framed YZ125's are notably 'flickable' and sometimes this trait is seen as a drawback since they tend to become more difficult to control on rough surfaces.<ref name=2010specs/> ==References== {{reflist|colwidth=30em}} ==External links== {{Official website|http://www.yamaha-motor.com/sport/products/modelhome/31/0/home.aspx}} {{Yamaha motorcycles}} [[Category:Yamaha motorcycles|YZ125]] [[Category:Off-road motorcycles]] [[Category:Motorcycles introduced in 1974]] [[Category:Two-stroke motorcycles]]'