1994-2001 Yamaha YZ125 – General Specifications

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Yamaha LogoGeneral Specifications For Your 1997-2001 Yamaha YZ125

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Tire Inflation Pressure

PSI (kPa)
Front And Rear Tire15 (103)

Recommended Lubricants And Fuel

Engine OilYamalube R 2-Stroke racing oil, Castrol R30 or Castrol A747
Transmission OilYamalube 4, SE SAE10W-30 or 10w-30 motor oil
Air FilterFoam air filter oil
Drive Chain*Chain lubricant or SAE 30-50 motor oil
Brake FluidDOT-4
Steering And Suspension LubricantMultipurpose grease
Fuel95 octane pump gas or higher
*Use kerosene to clean the drive chain.

Fuel/Oil Premix Ratio

Premix Ratio
All Models30:1

Fuel Tank Capacity

LitersU.S. gal.Imp. gal.
19957.72.031.69
1996-20018.02.111.76

Transmission Oil Capacity

MillilitersU.S. oz.Imp. oz.
Oil Change65021.9818.30
Total Capacity70023.6719.71

Coolant Capacity

LitersU.S. qt.Imp. qt.
All Models1.01.060.88

Maintenance Tightening Torques

ft.-lbin.-lb.N•n
Water Pump Drain Bolt
– 1994-1996788.8
– 1997-20018810
Cylinder Base Nuts2128
Cylinder Head Nuts2128
Spark Plug1520
Front Axle (1994-1995)4359
Front Axle Nut77105
Front Axle Clamp Nuts (1994)809
Front Axle Holder Bolts (1995-2001)1723
Kickstarter Mounting Bolt8810
Rear Axle Nut85115
Transmission Oil Drain Plug1520

Spark Plug Type And Gap

Spark Plug Gap0.019-0.024 in. (0.5-0.6 mm)
Spark Plug TypeNGK BR9EG

Carburetor Pilot Air Screw Adjustment

Initial Adjustment – Turns Out
19941-5/8 – 2-1/8
1995-1996
– Europe2
– All Other Models1-3/4
1997
– U.S. And Canada1-1/2
– All Other Models1-3/4
19982-1/4
1999
– Europe1-1/4
– All Other Models1-3/4
2000
– Europe1-3/4
– All Other Models1-1/2
2001
– Europe1-1/2
– All Other Models1-1/4

Drive Chain Slack

InchesMillimeters
1994-19951.2-1.430-35
1996-20011.6-2.040-50

Drive Chain And Sprocket Specifications

Drive Chain
Manufacturer
– 1998-2000 EuropeRagina 123RX1-A
– All Other ModelsDAIDO
Type
– 1998-2000 Europe123RX1-A
– All Other ModelsDID 520DS
Number Of Chain Links
– 1994114 + joint
– 1995-1996113 + joint
– 1997-2001111 + joint
Sprocket Sizes (Front/Rear)
– 1994-199613/50
– 1997 – 200113/48

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