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{{Infobox Motorcycle
{{DISPLAYTITLE:{{PAGENAME}}: review, history, specs}}
{{Motorcycle
|name            = Yamaha YZ125
|name            = Yamaha YZ125
|image            =  
|photo= Yamaha-yz125-2007-2007-1.jpg
|aka              =  
|aka              = YZ125X, YZ 125
|manufacturer    = [[Yamaha]]
|manufacturer    = Yamaha
|parent_company  =  
|parent_company  =
|production      = 74-08
|production      = 1997 - 2019
|model_year      =  
|model_year      =
|predecessor      =  
|predecessor      =
|successor        =  
|successor        =
|class            =  
|class            = Motocross
|engine          = 125
|engine          = single cylinder, two-stroke
|bore_stroke      =  
|bore_stroke      = 54.0mm x 54.5mm
|compression      =  
|compression      = 10.7:1
|top_speed        =  
|top_speed        =72 mph
|power            =  
|power            =
|torque          =  
|torque          = 17.7 ft/lbs (24.0 Nm) @ 10000RPM
|ignition        =  
|ignition        = cdi
|spark_plug      = {{sparkplug|B1OEV}} '77-80 , '81<br />{{sparkplug|B9EV}} '74-75<br />{{sparkplug|B9EG}} '82 , '84 , '85 , '88 , '89-93 , '94-96 , '97-98<br />{{sparkplug|BR9EG}} '83 , '86-87 , '99-04 , '05-08<br />{{sparkplug|B10EV}} '76
|spark_plug      = {{sparkplug|NGK B10EG}} '76-80 , '81<br />{{sparkplug|NGK B9EG}} '74-75<br />{{sparkplug|NGK B9EG}} '82 , '84-85 , '88-98<br />{{sparkplug|NGK BR9EG}} '83 , '86-87 , '99-08
|battery          =  
|battery          =  
|transmission    =  
|transmission    = Gear box: 6-speed <br>
|frame            =  
Final Drive: [[chain]] <br>
|suspension      =  
Clutch: multiplate [[wet clutch]] <br>
|brakes          =  
 
|frame            =
|suspension      =Front: kyb® speed-sensitive system inverted fork; fully adjustable <br>
Rear: kyb® single shock; fully adjustable
|brakes          =Front: single disc. hydraulic. <br>Rear: single disc. hydraulic.
|front_tire      = {{tire|3.00-21}} '76 , '77-80 , '81 , '82<br />{{tire|2.75-21}} '74-75<br />{{tire|80/100-21}} '86-87 , '88 , '89-93 , '94-96 , '97-98 , '99-04 , '05-08<br />{{tire|90/90-21}} '83 , '84 , '85
|front_tire      = {{tire|3.00-21}} '76 , '77-80 , '81 , '82<br />{{tire|2.75-21}} '74-75<br />{{tire|80/100-21}} '86-87 , '88 , '89-93 , '94-96 , '97-98 , '99-04 , '05-08<br />{{tire|90/90-21}} '83 , '84 , '85
|rear_tire    = {{tire|6675}} '76 , '77-80 , '81 , '82<br />{{tire|130/80-18}} '83 , '84 , '85<br />{{tire|100/90-19}} '89-93 , '94-96 , '97-98 , '99-04 , '05-08<br />{{tire|3.50-18}} '74-75<br />{{tire|100/100-18}} '86-87 , '88
|rear_tire    = {{tire|6675}} '76 , '77-80 , '81 , '82<br />{{tire|130/80-18}} '83 , '84 , '85<br />{{tire|100/90-19}} '89-93 , '94-96 , '97-98 , '99-04 , '05-08<br />{{tire|3.50-18}} '74-75<br />{{tire|100/100-18}} '86-87 , '88
|rake_trail      =  
|rake_trail      =
|wheelbase        =  
|wheelbase        = 56.81 inches (1443 mm)
|length          =  
|length          = 84.09 inches (2136 mm)
|width            =  
|width            = 32.6 inches (828 mm)
|height          =  
|height          = 50.98 inches (1295 mm)
|seat_height      =  
|seat_height      = 38.39 inches (975 mm)
|dry_weight      =  
|dry_weight      = 190.04 pounds (86.2 Kg)
|wet_weight      =  
|wet_weight      = 93.9 kg
|fuel_capacity    =  
|fuel_capacity    = 2.11 Gallon (8.00 Liters)
|oil_capacity    =  
|oil_capacity    =
|fuel_consumption =  
|recommended_oil= Yamalube 10w-40
|turning_radius  =  
|fuel_consumption =
|related          =  
|turning_radius  =
|competition      =  
|related          = [[Yamaha YZ50]]<br />[[Yamaha YZ60]]<br />[[Yamaha YZ80]]<br />[[Yamaha YZ85]]<br />[[Yamaha YZ100]]<br />[[Yamaha YZ125]]<br />[[Yamaha YZ250]]<br />[[Yamaha YZ400]]<br />[[Yamaha YZ465]]<br />[[Yamaha YZ490]]
|competition      = [[Honda CR125R]]<br />[[Kawasaki KX125]]<br />[[Suzuki RM125]]
}}
}}


The '''Yamaha YZ125''' was a [[two-stroke]] 125cc [[motocross]] [[dirtbike]] produced by [[Yamaha]] beginning in 1974.


==1974 YZ125A==
The '''[[Yamaha]] YZ125''' was a single cylinder, two-stroke Trial [[motorcycle]] produced by [[Yamaha]] between 1997 and 2019. Max [[torque]] was 17.7 ft/lbs (24.0 Nm) @ 10000 RPM. 
[[Image:1974-Yamaha-YZ125A-Silver-1490-0.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
 
[[Image:1974-Yamaha-YZ125A-Silver-1490-1.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
==Engine==
[[Image:1974-Yamaha-YZ125A-Silver-1490-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
The engine was a [[liquid cooled]] single cylinder, two-stroke. A 54.0mm [[bore]] x 54.5mm [[stroke]] result in a [[displacement]] of just 125.0 cubic centimeters. 
[[Image:1974-Yamaha-YZ125A-Silver-1490-3.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
 
[[Image:1974-Yamaha-YZ125A-Silver-1490-4.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
==Drive==
[[Image:1974-Yamaha-YZ125A-Silver-1490-5.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
The bike has a 6-speed transmission. Power was moderated via the multiplate wet clutch.
[[Image:1974-Yamaha-YZ125A-Silver-2047-0.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
 
[[Image:1974-Yamaha-YZ125A-Silver-2047-1.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
==Chassis==
[[Image:1974-Yamaha-YZ125A-Silver-2047-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
It came with a 80/100-21 front [[tire]] and a 100/90-19 rear tire. Stopping was achieved via single disc. hydraulic. in the front and a single disc. hydraulic. in the rear. The front suspension was a  kyb® speed-sensitive system inverted fork; fully adjustable while the rear was equipped with a kyb® single shock; fully adjustable. The YZ125 was fitted with a 2.11 Gallon (8.00 Liters) fuel tank. The bike weighed just 190.04 pounds (86.2 Kg). The wheelbase was 56.81 inches (1443 mm) long. 
[[Image:1974-Yamaha-YZ125A-Silver-2047-3.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
[[Image:1974-Yamaha-YZ125A-Silver-2047-4.jpg|left|thumb|1974 Yamaha YZ125A in Silver]]
<br style="clear: left"/>
*SERIAL # 453-000101 - 007730


==1976 YZ125C==
==First Generation==
<gallery>
===1974 YZ125A===
Image:1976-Yamaha-YZ125-Yellow-0.jpg|1976 Yamaha YZ125 in Yellow
<gallery mode='packed-hover'>
Image:1976-Yamaha-YZ125-Yellow-1.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-0.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-2.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-1.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-3.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-4.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-3.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-5.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-4.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-6.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-1490-5.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-7.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-2047-0.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-8.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-2047-1.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-1174-0.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-2047-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-1174-1.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-2047-3.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-1174-2.jpg|1976 Yamaha YZ125 in Yellow
File:1974-Yamaha-YZ125A-Silver-2047-4.jpg|left|thumb|1974 Yamaha YZ125A in Silver
Image:1976-Yamaha-YZ125-Yellow-1174-3.jpg|1976 Yamaha YZ125 in Yellow
Image:1976-Yamaha-YZ125-Yellow-1174-4.jpg|1976 Yamaha YZ125 in Yellow
Image:1976-Yamaha-YZ125-Yellow-1174-5.jpg|1976 Yamaha YZ125 in Yellow
Image:1976-Yamaha-YZ125C-Yellow-3338-0.jpg|1976 Yamaha YZ125C in Yellow
Image:1976-Yamaha-YZ125C-Yellow-3338-1.jpg|1976 Yamaha YZ125C in Yellow
Image:1976-Yamaha-YZ125C-Yellow-3338-2.jpg|1976 Yamaha YZ125C in Yellow
Image:1976-Yamaha-YZ125C-Yellow-3338-3.jpg|1976 Yamaha YZ125C in Yellow
Image:1976-Yamaha-YZ125C-Yellow-3338-4.jpg|1976 Yamaha YZ125C in Yellow
Image:1976-Yamaha-YZ125-Yellow-1803-0.jpg|1976 Yamaha YZ125 in Yellow
Image:1976-Yamaha-YZ125-Yellow-1803-1.jpg|1976 Yamaha YZ125 in Yellow
</gallery>
</gallery>
<br style="clear: left"/>
<br style="clear: left"/>
*SERIAL # 453-000101 - 007730


==1975==
===1976 YZ125C ===
===1975===
*SERIAL # 453-100101 - 101620
*SERIAL # 453-100101 - 101620


==1976==
===1976===
*SERIAL # 537-000101 - 014044
*SERIAL # 537-000101 - 014044


==1977==
===1977===
*SERIAL # 1W1-000101 - 015610
*SERIAL # 1W1-000101 - 015610


==1978==
===1978===
*SERIAL # 2K6-000101 - 015080
*SERIAL # 2K6-000101 - 015080


==1979==
==1979==
[[Image:1979-Yamaha-YZ125-Yellow-0.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-0.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-1.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-2.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-3.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-3.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-4.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-4.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-5.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-5.jpg|left|thumb|1979 Yamaha YZ125]]
<br style="clear: left"/>
*SERIAL # 2X3-000101 - N/A
==1980 YZ125G==
[[Image:1980-Yamaha-YZ125-G-Yellow-0.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-1.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-2.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-3.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-4.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-5.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-6.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-7.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-G-Yellow-8.jpg|left|thumb|1980 Yamaha YZ125-G in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-0.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-1.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-2.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-3.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-4.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
[[Image:1980-Yamaha-YZ125-Yellow-5.jpg|left|thumb|1980 Yamaha YZ125 in Yellow]]
<br style="clear: left"/>
*SERIAL # 3R3-000101 - ON
==1981 YZ125H==
[[Image:1981 Yamaha YZ125H profile.jpg|200px|thumb|left|1981 Yamaha YZ125H profile]]
[[Image:1981 Yamaha YZ125H.jpg|200px|thumb|left|1981 Yamaha YZ125H]]{{clear}}
Race-developed over a three year period, the YZ125H was the first [[liquid-cooled]] Yamaha motocrosser. The alloyed aluminum radiator was mounted to the top triple clamp. Coolant was channeled through the handlebar crown, [[steering head]] pipe and the down pipe of the frame. Liquid-cooling helped minimize heat-induced power loss racers experienced during a race.
==1983 YZ125==
[[Image:1983-Yamaha-YZ125-Yellow-46-0.jpg|left|thumb|1983 Yamaha YZ125 in Yellow]]
[[Image:1983-Yamaha-YZ125-Yellow-46-1.jpg|left|thumb|1983 Yamaha YZ125 in Yellow]]
[[Image:1983-Yamaha-YZ125-Yellow-46-2.jpg|left|thumb|1983 Yamaha YZ125 in Yellow]]
[[Image:1983-Yamaha-YZ125-Yellow-46-3.jpg|left|thumb|1983 Yamaha YZ125 in Yellow]]
<br style="clear: left"/>
==1984 YZ125==
[[Image:1984-Yamaha-YZ125-Yellow-8459-0.jpg|left|thumb|1984 Yamaha YZ125 in Yellow]]
[[Image:1984-Yamaha-YZ125-Yellow-8459-1.jpg|left|thumb|1984 Yamaha YZ125 in Yellow]]
[[Image:1984-Yamaha-YZ125-Yellow-8459-2.jpg|left|thumb|1984 Yamaha YZ125 in Yellow]]
[[Image:1984-Yamaha-YZ125-Yellow-8459-3.jpg|left|thumb|1984 Yamaha YZ125 in Yellow]]
<br style="clear: left"/>
==2006==
[[Image:2006-Yamaha-YZ125.jpg|left|thumb|2006 Yamaha YZ125]]
<br style="clear: left"/>
==2007==
[[Image:2007-Yamaha-YZ125.jpg|left|thumb|2007 Yamaha YZ125]]
<br style="clear: left"/>
==See Also==
*[[Yamaha YZ50]]
*[[Yamaha YZ80]]
*[[Yamaha YZ85]]
*[[Yamaha YZ250]]
*[[Yamaha YZ400]]
*[[Yamaha YZ490]]
{{template:Yamaha YZ}}
{{Yamaha}}
[[Category:Yamaha motorcycles|YZ125, Yamaha]]
[[Category:Yamaha YZ series]]
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