Yamaha YZ125: review, history, specs

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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+
Yamaha YZ125 (2007~)	Yamaha YZ125 (2017~)

History[edit | edit source]

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

Specifications[edit | edit source]

Yamaha YZ125 (2005+): specs.

Specifications
DIMENSIONS	Overall length	2135 mm / 84,1 in
	Overall width	827 mm / 32,6 in
	Overall height	1315 mm / 51,8 in
	Seat height	997 mm / 39,3 in 975 mm / 38,4 in – YZ125 (2015+)
	Wheelbase	1443 mm / 56,8 in
	Ground clearance	386 mm / 15,2 in 365 mm / 14,4 in – YZ125 (2015+)
	Dry weight
	Curb (wet) weight	94 kg / 207 lbs
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
	Fuel capacity	8,0 l / 2,1 US gal
	Trail	105 mm / 4,1 in 109 mm / 4,3 in – YZ125 (2015+)
	Fuel economy
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
	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
	0 to 100 km/h
	Top speed
CARBURETION SYSTEM	Type	Carburetor, 1x Mikuni TMX38
CARBURETION SYSTEM	ID
DRIVE TRAIN	Clutch	Wet, multi-plate
	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