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{{Infobox Motorcycle
{{Infobox Motorcycle
| name = YZ125
| name = YZ125
| image = Yamaha YZ125 Motorcycle.jpg
| image =
| manufacturer = [[Yamaha Motor Company|Yamaha]]
| manufacturer = [[Yamaha Motor Company|Yamaha]]
| parent_company =
| parent_company =
| production = 1974–present
| production = Since 1974
| predecessor =
| predecessor =
| successor =
| successor =
| class = [[Motocross]]
| class = [[Motocross]]
| engine = {{convert|124|cc|cuin|abbr=on}} [[single-cylinder]], [[Two-stroke engine|two-stroke]], [[Reed valve#Two-stroke engines|reed valve-inducted]]
| engine = {{cvt|124|cc}} reed valve [[Two-stroke engine|two-stroke]] [[Single-cylinder engine|single]]
| power = {{cvt|33.53|hp}}<ref name="MCA"/>
⚫
| power = {{convert|69|hp|kW|abbr=on}}<ref name="MCA">{{cite web |title=TWO-STROKE SHOOTOUT: KTM 125SX Vs. YAMAHA YZ125 |url=https://motocrossactionmag.com/2016-mxa-125-two-stroke-shootout-ktm-125sx-vs-yamaha-yz125/ |website=Motocross Action Magazine |accessdate=6 May 2019 |date=19 November 2016}}</ref>
| torque =18.3 ft-lbs
| torque =
| '''transmission''' = 5 or 6-speed
| transmission = 5- or 6-speed [[Sequential manual transmission|sequential manual]]
| suspension = Mono-shock, 13 inches travel
| suspension = Mono-shock, 13 inches travel
| brakes = Hydraulic disk
| brakes = Hydraulic disc
| tires = front 80/100-21-51M, rear 100/90-19-57M
| tires = Front: 80/100-21-51M<br />Rear: 100/90-19-57M
| top speed = {{convert|120|mph|kph|abbr=on}}
| top speed =
| rake_trail =
| rake_trail =
| wheelbase = {{convert|56.8|in|cm|abbr=on}}
| wheelbase = {{cvt|56.8|in|order=flip}}
| length= {{convert|84.1|in|cm|abbr=on}}
| length= {{cvt|84.1|in|order=flip}}
| width= {{convert|32.6|in|cm|abbr=on}}
| width= {{cvt|32.6|in|order=flip}}
| height= {{convert|51.8|in|cm|abbr=on}}
| height= {{cvt|51.8|in|order=flip}}
| seat_height = {{convert|39.3|in|cm|abbr=on}}
| seat_height = {{cvt|39.3|in|order=flip}}
| dry_weight = {{convert|190|lb|kg|abbr=on}}
| dry_weight = {{cvt|190|lb|order=flip}}
| wet_weight = {{cvt|208|lb|order=flip}}<ref name=2010specs/>
⚫
| 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 |url-status=dead |archiveurl=https://web.archive.org/web/20091125205822/http://www.yamaha-motor.com/sport/products/modelspecs/31/0/specs.aspx |archivedate=2009-11-25 }}</ref>
| fuel_capacity = {{convert|2.1|usgal|l|abbr=on}}
| fuel_capacity = {{cvt|2.1|usgal|order=flip}}
| related = [[Yamaha YZ250F]]
| 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]]. 1973: Although very few were actually made, Yamaha did produce a YZ125 in 1973. It was not offered to the general public, but a dealer in good standing could submit a rider resume to the importer and hope to obtain a semi-works bike. However rare, this goes down in the books as the first bike with the YZ125 name. For the first two years it was made with dual rear shocks (dirt bikes ever, due to their wide powerband and excellent handling.<ref>{{cite web |title=MXA's 20 MOST FREQUENTLY ASKED QUESTIONS |url=http://www.motocrossactionmag.com/me2/dirsect.asp?sid=F42B9D67B8404E24AA0EF9B32A75BA62&nm=FAQ%27S |archive-url=https://web.archive.org/web/20100227054517/http://www.motocrossactionmag.com/me2/dirsect.asp?sid=F42B9D67B8404E24AA0EF9B32A75BA62&nm=FAQ%27S |url-status=dead |archive-date=27 February 2010 |website=MotoCross Action Magazine |accessdate=6 May 2019}}</ref> The YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.<ref>{{Cite web |url= http://www.motocrossactionmag.com/me2/dirsect.asp?sid=9945527E1D6A4953ACE23BB700C838FF&nm=EVERY+CHAMP |title= EVERY CHAMP {{!}} Motocross Action |access-date= 2007-05-09 |archive-url= https://archive.today/20120905024841/http://www.motocrossactionmag.com/me2/dirsect.asp?sid=9945527E1D6A4953ACE23BB700C838FF&nm=EVERY+CHAMP |archive-date= 2012-09-05 |url-status=dead }}</ref>
The '''Yamaha YZ125''' is a [[motocross]] [[racing motorcycle]] with a [[Two-stroke engine|two-stroke]] {{cvt|124.9|cc}} [[Engine displacement|displacement]] [[single-cylinder engine]] made by [[Yamaha Motor Company|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]].<ref>{{cite web |title=MXA's 20 Most Frequently Asked Questions |url=http://www.motocrossactionmag.com/me2/dirsect.asp?sid=F42B9D67B8404E24AA0EF9B32A75BA62&nm=FAQ%27S |archive-url=https://web.archive.org/web/20100227054517/http://www.motocrossactionmag.com/me2/dirsect.asp?sid=F42B9D67B8404E24AA0EF9B32A75BA62&nm=FAQ%27S |url-status=dead |archive-date=27 February 2010 |website=MotoCross Action Magazine |access-date=6 May 2019}}</ref> The YZ125 has been ridden to five AMA National Motocross Championships, and multiple AMA Regional Supercross Championships.<ref>{{Cite web |url= http://www.motocrossactionmag.com/me2/dirsect.asp?sid=9945527E1D6A4953ACE23BB700C838FF&nm=EVERY+CHAMP |title= EVERY CHAMP {{!}} Motocross Action |access-date= 2007-05-09 |archive-url= https://archive.today/20120905024841/http://www.motocrossactionmag.com/me2/dirsect.asp?sid=9945527E1D6A4953ACE23BB700C838FF&nm=EVERY+CHAMP |archive-date= 2012-09-05 |url-status=dead }}</ref>


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. However, the YZ250F has a slight horsepower advantage.<ref name="DBM">{{cite web |title=10 THINGS YOU MIGHT NOT KNOW ABOUT THE YZ125 |url=https://dirtbikemagazine.com/10-things-you-might-not-know-about-the-yz125/ |website=Dirt Bike Magazine |accessdate=6 May 2019}}</ref>
<ref name="DBM">{{cite web |title=10 Things You Might Not Know About The YZ125 |url=https://dirtbikemagazine.com/10-things-you-might-not-know-about-the-yz125/ |website=Dirt Bike Magazine |access-date=6 May 2019}}</ref>


==Engine==
⚫
The YZ 125 has had a liquid-cooled 124&nbsp;cc, [[Reed valve#Two-stroke engines|reed valve-inducted]], [[two-stroke engine]] since 1981. The models from 1974 to 1980 were air-cooled. The [[carburetor]] is a 38&nbsp;mm TMX series made by [[Mikuni (company)|Mikuni]].<ref name="MCA2016">{{cite web |title=2016 YAMAHA YZ125 TWO-STROKE RACE TEST: EVERYTHING YOU NEED TO KNOW |url=https://motocrossactionmag.com/mxa-2016-race-test-yamaha-yz125/ |website=MotoCross Action Magazine |accessdate=6 May 2019 |date=18 April 2016}}</ref> The engine produces {{convert|34|hp||abbr=on}}.<ref name="MCA" />


⚫
The YZ125 has a {{cvt|124|cc}} [[Reed valve#Two-stroke engines|reed valve-inducted]] [[two-stroke engine]]. It was air cooled from 1974 to 1980, and liquid cooled since 1981. It has a [[Mikuni (company)|Mikuni]] 38&nbsp;mm TMX series [[carburetor]].<ref name="MCA2016">{{cite web |title=2016 YAMAHA YZ125 Two-Stroke Race Test: Everything You Need To Know |url=https://motocrossactionmag.com/mxa-2016-race-test-yamaha-yz125/ |website=MotoCross Action Magazine |access-date=6 May 2019 |date=18 April 2016}}</ref> The engine produces {{cvt|35|hp|}}.<ref name="MCA" />
==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 gearbox|constant mesh]] wet, multiple-disc coil spring [[clutch]].
The revised gear ratios as of the 2005 model are:<ref name="OwnersManual">{{cite web |title=2015 YZ125 Manual |url=https://dd5394a0b8ca8e97ba29-abf76f3d91a2125517d6c7c409f095c7.ssl.cf1.rackcdn.com/content/common/manuals/2015/LIT-11626-28-24_595184a52a0ab7877c39108c.pdf |website=Yamaha |accessdate=6 May 2019 |page=2-2}}</ref>
*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)


⚫
The YZ125 has been built with five- or six-speed [[sequential gearbox|manual sequential gearbox]] depending on model year. The 2005 model has a [[Constant-mesh gearbox|constant-mesh]], wet, multiple-disc coil-spring [[clutch]].
==Frame==
⚫
From 1973 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, the wheel assemblies and front fork suspension were redesigned, yielding additional weight savings, making wet weight, no gas sub-200&nbsp;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.<ref name=2010specs/>


Front Suspension:
The YZ125 used a conventional telescopic fork tube through 1988, then in 1989, added the first "upside down" fork. In the years that followed, the front suspension tube diameter and spring rate progressed as follows:


⚫
From 1973 through 2004, the YZ125 had a single backbone frame made from steel. It generally averaged from {{cvt|176|to|198|lb}}.{{cn|date=September 2020}} 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 {{cvt|190|lb}}.{{cn|date=September 2020}} For 2008 models, the wheel assemblies and front fork suspension were redesigned, yielding additional weight savings, making wet weight, no gas sub-200&nbsp;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.<ref name=2010specs/> The YZ125 used a conventional telescopic fork tube through 1988, then in 1989, added the first upside-down fork. A number of well known riders have chosen this as their go-to bike, such as AMA Champ Dom Barbuto and his brother Nick Barbuto, X-Games medalist Kyle Ford, and StinkBike Racing's own local Seattle legend Joey Merkin. Also, 11-time Nationals winner and rival of Eli Tomac, Richard Rich
* 1989-1990: 41mm, .36 kg/mm
* 1991: 43mm, .36kg/mm
* 1992-1993: 43mm, .38 kg/mm
* 1994-1995: 43mm, .39kg/mm
* 1996: 46mm, .40kg/mm
* 1997: 46mm, .41kg/mm
* 1998: 46mm, .43kg/mm
* 1999-2003: 46mm, .41kg/mm
* 2004: 48mm, .41kg/mm
* 2005-2012: 48mm, .418kg/mm
* 2013-2021: 48mm, .42kg/mm
<ref>https://racetech.com/</ref>


==References==
==References==
{{reflist|colwidth=30em}}
{{reflist|refs=

⚫
<ref name="MCA">{{cite web |title=Two-Stroke Shootout: KTM 125SX Vs. YAMAHA YZ25 |url=https://motocrossactionmag.com/2016-mxa-125-two-stroke-shootout-ktm-125sx-vs-yamaha-yz125/ |website=Motocross Action Magazine |access-date=6 May 2019 |date=19 November 2016}}</ref>

⚫
<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 |access-date=2009-12-05 |url-status=dead |archive-url=https://web.archive.org/web/20091125205822/http://www.yamaha-motor.com/sport/products/modelspecs/31/0/specs.aspx |archive-date=2009-11-25 }}</ref>

}}


==External links==
==External links==

Latest revision as of 04:42, 30 September 2024

YZ125
ManufacturerYamaha
ProductionSince 1974
ClassMotocross
Engine124 cc (7.6 cu in) reed valve two-stroke single
Power33.53 hp (25.00 kW)[1]
Transmission5- or 6-speed sequential manual
SuspensionMono-shock, 13 inches travel
BrakesHydraulic disc
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

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]

[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 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).[citation needed] 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).[citation needed] 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 number of well known riders have chosen this as their go-to bike, such as AMA Champ Dom Barbuto and his brother Nick Barbuto, X-Games medalist Kyle Ford, and StinkBike Racing's own local Seattle legend Joey Merkin. Also, 11-time Nationals winner and rival of Eli Tomac, Richard Rich

References

[edit]
  1. ^ a b "Two-Stroke Shootout: KTM 125SX Vs. YAMAHA YZ25". Motocross Action Magazine. 19 November 2016. Retrieved 6 May 2019.
  2. ^ a b 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.
[edit]
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