Yamaha YZ125: review, history, specs

From BikesWiki.com, Japanese Motorcycle Encyclopedia

Class: motocross

Production: 1974+

Models
Yamaha YZ125

(steel frame, telescopic fork)

(Europe, North America)

1988

Yamaha YZ125

(+ inverted fork)

(Europe, North America)

1989

Yamaha YZ125

(+ aluminum frame)

(All markets)

2005

Yamaha YZ125 (1988)
Yamaha YZ125 (1989~)
Yamaha YZ125 (2005~)
Models
Yamaha YZ125

(+ petal brake discs)

(All markets)

2007

Yamaha YZ125

(+ front brake disc 250 → 270 mm)

(All markets)

2017-2021

Yamaha YZ125

(All markets)

2022+

Yamaha YZ125 (2007~)
Yamaha YZ125 (2017~)
Yamaha YZ125 (2022+)
Models
Yamaha YZ125 Monster Energy Yamaha Racing Edition

(All markets)

2022

Yamaha YZ125 Monster Energy Yamaha Racing Edition

History

History
Year Country Name / Frame / Engine
1974 USA Name: Yamaha YZ125

Code: YZ125A

1975 USA Name: Yamaha YZ125

Code: YZ125B

1976 USA Name: Yamaha YZ125; Yamaha YZ125X

Code: YZ125C

1977 USA Name: Yamaha YZ125

Code: YZ125D

1978 USA Name: Yamaha YZ125

Code: YZ125E

1979 USA Name: Yamaha YZ125

Code: YZ125F

1980 USA Name: Yamaha YZ125

Code: YZ125G

1981 USA Name: Yamaha YZ125

Code: YZ125H

1982 USA Name: Yamaha YZ125

Code: YZ125J

1983 USA Name: Yamaha YZ125

Code: YZ125K

1984 USA Name: Yamaha YZ125

Code: YZ125L

1985 USA Name: Yamaha YZ125

Code: YZ125N

1986 USA, Europe Name: Yamaha YZ125

Code: YZ125S, 1LX, 1LX0

1987 USA, Europe Name: Yamaha YZ125

Code: YZ125T, 2HG

1988 USA, Europe Name: Yamaha YZ125

Code: YZ125U, 2VN

1989 USA, Europe Name: Yamaha YZ125

Code: YZ125W, 3JD1

1990 All markets Name: Yamaha YZ125

Code: YZ125A, 3SR1, 3SR2, 3SR3, 3SR4

1991 All markets Name: Yamaha YZ125

Code: YZ125B, 3XJ1, 3XJ2, 3XJ3, 3XJ4

1992 All markets Name: Yamaha YZ125

Code: YZ125D, 4DB1, 4DB2, 4DB3, 4DB4

1993 All markets Name: Yamaha YZ125

Code: YZ125E, 4EX1, 4EX2, 4EX3, 4EX4

1994 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125F, 4JY1, 4JY2, 4JY3, 4JY4

1995 All markets Name: Yamaha YZ125

Code: YZ125G, 4PE1, 4PE2, 4PE3, 4PE4

1996 All markets Name: Yamaha YZ125

Code: YZ125H, 4SS1, 4SS2, 4SS3, 4SS4

1997 All markets Name: Yamaha YZ125

Code: YZ125J, 4XM1, 4XM2, 4XM3, 4XM4

1998 All markets Name: Yamaha YZ125

Code: YZ125K, 5DH1, 5DH2, 5DH3, 5DH4

1999 All markets Name: Yamaha YZ125

Code: YZ125L, 5ET1, 5ET2, 5ET3

2000 All markets Name: Yamaha YZ125

Code: YZ125M, 5HD1, 5HD2, 5HD3, 5HD4

2001 All markets Name: Yamaha YZ125

Code: YZ125N, 5MV1, 5MV2, 5MV3, 5MV4

2002 All markets Name: Yamaha YZ125

Code: YZ125P, 5NY1, 5NY2, 5NY3, 5NY4

2003 All markets Name: Yamaha YZ125

Code: YZ125R, 5UN1, 5UN2, 5UN3, 5UN4

2004 All markets Name: Yamaha YZ125

Code: YZ125S, 5XE1, 5XE2, 5XE3, 5XE4

2005 All markets Name: Yamaha YZ125

Code: YZ125T1, 1C31, 1C32, 1C33, 1C34

2006 All markets Name: Yamaha YZ125

Code: YZ125V, 1C35, 1C36, 1C37, 1C38

2007 All markets Name: Yamaha YZ125

Code: YZ125W1, 1C39, 1C3A, 1C3B, 1C3C

2008 All markets Name: Yamaha YZ125

Code: YZ125X, 1C3D, 1C3E, 1C3F, 1C3G

2009 All markets Name: Yamaha YZ125

Code: YZ125Y, 1C3H, 1C3J, 1C3K, 1C3L

2010 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125Z, 1C3N, 1C3M, 1C3P

2011 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125A1, 1C3S, 1C3T, 1C3U

2012 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125B1, 1SR1, 1SR2, 1SR3

2013 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125D2, 1SR5, 1SR6, 1SR7

2014 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125E2, 1SR9, 1SRA, 1SRB

2015 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125F2, 1SRD, 1SRE, 1SRF

2016 North America, Europe, Japan Name: Yamaha YZ125

Code: 1SRH, 1SRJ, 1SRK

2017 North America, Europe, Japan Name: Yamaha YZ125; Yamaha YZ125X

Code: YZ125H2, 1SRN, 1SRM, 1SRP; B1B1

2018 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125J2, 1SRS, 1SRT, 1SRU

2019 North America, Europe, Japan Name: Yamaha YZ125

Code: YZ125K2

2020 North America, Europe, Japan Name: Yamaha YZ125
2021 North America, Europe, Japan Name: Yamaha YZ125
2022 All Name: Yamaha YZ125
2023 All Name: Yamaha YZ125
2024 All Name: Yamaha YZ125

Specifications

Yamaha YZ125 (2005+): specs.

Specifications
DIMENSIONS Overall length 2135 mm / 84,1 in
Overall width 827 mm / 32,6 in

825 mm / 32,5 in - 2022+

Overall height 1315 mm / 51,8 in

1295 mm / 51,0 in - 2022+

Seat height 997 mm / 39,3 in

975 mm / 38,4 in – YZ125 (2015+)

Wheelbase 1443 mm / 56,8 in

1440 mm / 56,9 in - 2022+

Ground clearance 386 mm / 15,2 in

365 mm / 14,4 in – YZ125 (2015+)

Dry weight
Curb (wet) weight 94 kg / 207 lbs

95 kg / 209 lbs - 2022+

FRAME Type Semi double cradle (aluminum)
Front suspension, travel 48 mm inverted telescopic fork (fully adjustable), 300 mm / 11,8 in
Rear suspension, travel Swingarm with mono-shock (fully adjustable), 315 mm /12,4 in
Front tire size 80/100-21 51M
Rear tire size 100/90-19 57M
Front brake Single disc, 250 mm, 2-piston caliper – YZ125 (to 2017)

Single disc, 270 mm, 2-piston caliper – YZ125 (2017+)

Rear brake Single disc, 245 mm, 1-piston caliper

Single disc, 240 mm, 1-piston caliper - 2022+

Fuel capacity 8,0 l / 2,1 US gal

7,0 l / 1,8 US gal - 2022+

Trail 105 mm / 4,1 in

109 mm / 4,3 in – YZ125 (2015+)

Fuel economy / consumption
ENGINE Type Liquid-cooled 2-stroke
Cylinder arrangement Single cylinder
Bore & Stroke 54,0 x 54,5 mm
Displacement 124 cm³ (4,19 cu in)
Compression ratio 8.6~10.7:1

8.2~10.1:1 - 2022+

Valve train reed-valve inducted (YPVS)
Max. power 39,0 hp (28,7 kW) / 11500 rpm
Max. torque 25,5 Nm (2,6 kg-m) / 10000 rpm
Acceleration 0 to 100 km/h (0-60 mph)
Top speed
CARBURETION SYSTEM Type Carburetor, 1x Mikuni TMX38

Carburetor, 1x Keihin PWK38S - 2022+

ID
DRIVE TRAIN Clutch Wet, multi-plate, cable operated
Transmission 6-speed
Final drive Chain
Primary reduction 3.368
Final reduction
Gear ratio

I

II

III

IV

V

VI

2.385

1.933

1.588

1.353

1.200

1.095

ELECTRICAL Ignition CDI
Alternator A.C. magneto
Battery capacity

Images

Yamaha YZ125: images, gallery.

Yamaha YZ125
Yamaha YZ125
Yamaha YZ125

Videos

Yamaha YZ125: video.

Load video
YouTube
First Ride 2018 Yamaha YZ125 two stroke

Manuals

Yamaha YZ125: manuals, parts, microfiches.

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