General Specifications For Your 1997-2001 Yamaha YZ125
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Tire Inflation Pressure
| PSI (kPa) | |
| Front And Rear Tire | 15 (103) |
Recommended Lubricants And Fuel
| Engine Oil | Yamalube R 2-Stroke racing oil, Castrol R30 or Castrol A747 |
| Transmission Oil | Yamalube 4, SE SAE10W-30 or 10w-30 motor oil |
| Air Filter | Foam air filter oil |
| Drive Chain* | Chain lubricant or SAE 30-50 motor oil |
| Brake Fluid | DOT-4 |
| Steering And Suspension Lubricant | Multipurpose grease |
| Fuel | 95 octane pump gas or higher |
| *Use kerosene to clean the drive chain. | |
Fuel/Oil Premix Ratio
| Premix Ratio | |
| All Models | 30:1 |
Fuel Tank Capacity
| Liters | U.S. gal. | Imp. gal. | |
| 1995 | 7.7 | 2.03 | 1.69 |
| 1996-2001 | 8.0 | 2.11 | 1.76 |
Transmission Oil Capacity
| Milliliters | U.S. oz. | Imp. oz. | |
| Oil Change | 650 | 21.98 | 18.30 |
| Total Capacity | 700 | 23.67 | 19.71 |
Coolant Capacity
| Liters | U.S. qt. | Imp. qt. | |
| All Models | 1.0 | 1.06 | 0.88 |
Maintenance Tightening Torques
| ft.-lb | in.-lb. | N•n | |
| Water Pump Drain Bolt | |||
| – 1994-1996 | – | 78 | 8.8 |
| – 1997-2001 | – | 88 | 10 |
| Cylinder Base Nuts | 21 | – | 28 |
| Cylinder Head Nuts | 21 | – | 28 |
| Spark Plug | 15 | – | 20 |
| Front Axle (1994-1995) | 43 | – | 59 |
| Front Axle Nut | 77 | – | 105 |
| Front Axle Clamp Nuts (1994) | – | 80 | 9 |
| Front Axle Holder Bolts (1995-2001) | 17 | – | 23 |
| Kickstarter Mounting Bolt | – | 88 | 10 |
| Rear Axle Nut | 85 | – | 115 |
| Transmission Oil Drain Plug | 15 | – | 20 |
Spark Plug Type And Gap
| Spark Plug Gap | 0.019-0.024 in. (0.5-0.6 mm) |
| Spark Plug Type | NGK BR9EG |
Carburetor Pilot Air Screw Adjustment
| Initial Adjustment – Turns Out | |
| 1994 | 1-5/8 – 2-1/8 |
| 1995-1996 | |
| – Europe | 2 |
| – All Other Models | 1-3/4 |
| 1997 | |
| – U.S. And Canada | 1-1/2 |
| – All Other Models | 1-3/4 |
| 1998 | 2-1/4 |
| 1999 | |
| – Europe | 1-1/4 |
| – All Other Models | 1-3/4 |
| 2000 | |
| – Europe | 1-3/4 |
| – All Other Models | 1-1/2 |
| 2001 | |
| – Europe | 1-1/2 |
| – All Other Models | 1-1/4 |
Drive Chain Slack
| Inches | Millimeters | |
| 1994-1995 | 1.2-1.4 | 30-35 |
| 1996-2001 | 1.6-2.0 | 40-50 |
Drive Chain And Sprocket Specifications
| Drive Chain | |
| Manufacturer | |
| – 1998-2000 Europe | Ragina 123RX1-A |
| – All Other Models | DAIDO |
| Type | |
| – 1998-2000 Europe | 123RX1-A |
| – All Other Models | DID 520DS |
| Number Of Chain Links | |
| – 1994 | 114 + joint |
| – 1995-1996 | 113 + joint |
| – 1997-2001 | 111 + joint |
| Sprocket Sizes (Front/Rear) | |
| – 1994-1996 | 13/50 |
| – 1997 – 2001 | 13/48 |
