Difference between revisions of "Yamaha YZ125"

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{{Infobox Motorcycle
{{DISPLAYTITLE:{{PAGENAME}}: review, history, specs}}
| name = Yamaha YZ125
{{Motorcycle
| image = [[Image:2007-Yamaha-YZ125.jpg|200px]]
|name             = Yamaha YZ125
| aka =  
|photo= Yamaha-yz125-2007-2007-1.jpg
| manufacturer = [[Yamaha]]
|aka             = YZ125X, YZ 125
| production = 1974-2006
|manufacturer     = Yamaha
| predecessor =  
|parent_company  =
| successor =  
|production       = 1997 - 2019
| parent_company =  
|model_year      =
| class = [[Motocross]]
|predecessor      =
| platform =
|successor        =
| engine = 125cc [[two-stroke]] [[single cylinder]]
|class           = Motocross
| transmission =  
|engine           = single cylinder, two-stroke
| spark_plug = [[B9EV]] '74-76 <br /> [[B10EV]] '77-81 <br /> [[B9EG]] or [[BR9EG]] '82-'06
|bore_stroke      = 54.0mm x 54.5mm
| rake =  
|compression      = 10.7:1
| trail =  
|top_speed        =72 mph
| wheelbase =
|power            =
| front_tire = 2.75x21 '74-75 <br />3.00x21 '76-82<br />90/80-21 '83 <br /> 90/90-21 '84-85<br />80/100-21 '86-06
|torque          = 17.7 ft/lbs (24.0 Nm) @ 10000RPM
| rear_tire = 3.50x18 '74-75<br/>4.10x18 '76-82 <br />130/80-18 '83 <br />120/80-18 '84-85 <br />100/100-18 '86-88 <br /> 110/90-19 '89-90 <br /> 100/90-19 '91-93 <br /> 110/90-19 '94 <br /> 100/90-19 '95-06
|ignition        = cdi
| length =  
|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
| width =  
|battery          =
| seat_height =  
|transmission    = Gear box: 6-speed <br>
| dry_weight =  
Final Drive: [[chain]] <br>
| wet_weight =  
Clutch: multiplate [[wet clutch]] <br>
| fuel_economy =  
 
| fuel_capacity =  
|frame            =
| related= [[Yamaha YZ80]]<br />[[Yamaha YZ100]]<br />[[Yamaha YZ250]] <br /> [[Yamaha YZ360]] <br /> [[Yamaha YZ400]]
|suspension      =Front: kyb® speed-sensitive system inverted fork; fully adjustable <br>
| competition= [[Honda CR125R]]<br />[[Yamaha YZ125]]<br />[[Suzuki RM125]] <br /> [[Kawasaki KX125]]
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
|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      =
|wheelbase        = 56.81 inches (1443 mm)
|length           = 84.09 inches (2136 mm)
|width           = 32.6 inches (828 mm)
|height          = 50.98 inches (1295 mm)
|seat_height     = 38.39 inches (975 mm)
|dry_weight       = 190.04 pounds (86.2 Kg)
|wet_weight       = 93.9 kg
|fuel_capacity    = 2.11 Gallon (8.00 Liters)
|oil_capacity    =
|recommended_oil= Yamalube 10w-40
|fuel_consumption =
|turning_radius  =
|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]][[Image:1974-Yamaha-YZ125A-Silver-1490-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver]][[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]][[Image:1974-Yamaha-YZ125A-Silver-1490-5.jpg|left|thumb|1974 Yamaha YZ125A in Silver]][[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]][[Image:1974-Yamaha-YZ125A-Silver-2047-2.jpg|left|thumb|1974 Yamaha YZ125A in Silver]][[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"/>
==Engine==
*SERIAL # 453-000101 - 007730
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. 
 
==Drive==
The bike has a 6-speed transmission. Power was moderated via the multiplate wet clutch. 
 
==Chassis==
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. 


==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-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-4.jpg|left|thumb|1979 Yamaha YZ125]][[Image:1979-Yamaha-YZ125-Yellow-5.jpg|left|thumb|1979 Yamaha YZ125]]
[[Image:1979-Yamaha-YZ125-Yellow-0.jpg|left|thumb|1979 Yamaha YZ125]]
<br style="clear: left"/>
[[Image:1979-Yamaha-YZ125-Yellow-3.jpg|left|thumb|1979 Yamaha YZ125]]
 
[[Image:1979-Yamaha-YZ125-Yellow-4.jpg|left|thumb|1979 Yamaha YZ125]]
*SERIAL # 2X3-000101 - N/A
[[Image:1979-Yamaha-YZ125-Yellow-5.jpg|left|thumb|1979 Yamaha YZ125]]
==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}}
 
[[Category:Yamaha motorcycles|YZ125, Yamaha]]
[[Category:Yamaha YZ series]]

Latest revision as of 01:08, 22 February 2023

Yamaha-yz125-2007-2007-1.jpg
Yamaha YZ125
Manufacturer
Yamaha
Also called YZ125X, YZ 125
Production 1997 - 2019
Class Motocross
Engine
single cylinder, two-stroke
Bore / Stroke 54.0mm x 54.5mm
Compression ratio 10.7:1
Top Speed 72 mph
Torque 17.7 ft/lbs (24.0 Nm) @ 10000RPM
Ignition cdi
Spark Plug NGK B10EG '76-80 , '81
NGK B9EG '74-75
NGK B9EG '82 , '84-85 , '88-98
NGK BR9EG '83 , '86-87 , '99-08
Transmission Gear box: 6-speed

Final Drive: chain

Clutch: multiplate wet clutch
Suspension Front: kyb® speed-sensitive system inverted fork; fully adjustable
Rear: kyb® single shock; fully adjustable
Brakes Front: single disc. hydraulic.
Rear: single disc. hydraulic.
Front Tire 3.00-21 '76 , '77-80 , '81 , '82
2.75-21 '74-75
80/100-21 '86-87 , '88 , '89-93 , '94-96 , '97-98 , '99-04 , '05-08
90/90-21 '83 , '84 , '85
Rear Tire 6675 '76 , '77-80 , '81 , '82
130/80-18 '83 , '84 , '85
100/90-19 '89-93 , '94-96 , '97-98 , '99-04 , '05-08
3.50-18 '74-75
100/100-18 '86-87 , '88
Wheelbase 56.81 inches (1443 mm)
Length 84.09 inches (2136 mm)
Width 32.6 inches (828 mm)
Height 50.98 inches (1295 mm)
Seat Height 38.39 inches (975 mm)
Weight 190.04 pounds (86.2 Kg) (dry), 93.9 kg (wet)
Recommended Oil Yamalube 10w-40
Fuel Capacity 2.11 Gallon (8.00 Liters)
Related Yamaha YZ50
Yamaha YZ60
Yamaha YZ80
Yamaha YZ85
Yamaha YZ100
Yamaha YZ125
Yamaha YZ250
Yamaha YZ400
Yamaha YZ465
Yamaha YZ490
Competition Honda CR125R
Kawasaki KX125
Suzuki RM125
Manuals Service Manual

Brochures ·


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.

Engine[edit | edit source]

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.

Drive[edit | edit source]

The bike has a 6-speed transmission. Power was moderated via the multiplate wet clutch.

Chassis[edit | edit source]

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.

First Generation[edit | edit source]

1974 YZ125A[edit | edit source]

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver

  • 1974 Yamaha YZ125A in Silver


  • SERIAL # 453-000101 - 007730

1976 YZ125C[edit | edit source]

1975[edit | edit source]

  • SERIAL # 453-100101 - 101620

1976[edit | edit source]

  • SERIAL # 537-000101 - 014044

1977[edit | edit source]

  • SERIAL # 1W1-000101 - 015610

1978[edit | edit source]

  • SERIAL # 2K6-000101 - 015080

1979[edit | edit source]

1979 Yamaha YZ125
1979 Yamaha YZ125
1979 Yamaha YZ125
1979 Yamaha YZ125
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