Yamaha WR250F Tightening Torque Specifications
As with most motorcycles, each component that is tightened with a bolt has a tightening size with a certain torque unit. This is intended so that each component on the motorcycle is firmly united but not excessive so that the locking bolt becomes worn out. Including on the wr250F motorcycle. Here are the tightening torque sizes for each part of the motorcycle that is tightened with a bolt.
This chart provides tightening torques for regular fasteners with standard ISO thread pitch. Special components or assemblies may have different tightening torque specifications, which can be found in the relevant chapters of this manual. To prevent warping, tighten fasteners in a zigzag pattern and in stages until you reach the specified tightening torque. Unless otherwise noted, all tightening torques assume clean, dry threads and components at room temperature.
A.Distance between flats
B.Outside thread diameter
| A (nut) | B (bolt) | General tightening torques | ||
|---|---|---|---|---|
| N·m | kgf·m | lb·ft | ||
| 10 mm | 6 mm | 6 | 0.6 | 4.4 |
| 12 mm | 8 mm | 15 | 1.5 | 11 |
| 14 mm | 10 mm | 30 | 3.0 | 22 |
| 17 mm | 12 mm | 55 | 5.5 | 41 |
| 19 mm | 14 mm | 85 | 8.5 | 63 |
| 22 mm | 16 mm | 130 | 13.0 | 96 |
ENGINE TIGHTENING TORQUES
| Item | Thread size | Q’ty | Tightening torques |
|---|---|---|---|
| Camshaft cap bolt | M6 | 8 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Spark plug | M10 | 1 | 13 N·m (1.3 kgf·m, 9.6 lb·ft) |
| Cylinder head stud bolt (exhaust pipe) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Oil passage plug (cylinder head) | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Cylinder head bolt | M9 | 4 | See TIP. |
| Cylinder head nut | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Cylinder head cover bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Stud bolt (cylinder head cover) | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Cylinder bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Oil pressure check bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Balancer weight plate screw | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Balancer weight gear nut | M14 | 1 | 50 N·m (5.0 kgf·m, 37 lb·ft) |
| Balancer nut | M10 | 1 | 38 N·m (3.8 kgf·m, 28 lb·ft) |
| Timing chain guide stopper plate (exhaust side) | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Timing chain tensioner cap bolt | M6 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Timing chain tensioner bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Coolant drain bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Radiator hose clamp screw | M6 | 8 | 1.5 N·m (0.15 kgf·m, 1.1 lb·ft) |
| Radiator bolt | M6 | 4 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Radiator pipe joint bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Radiator fan bolt | M6 | 3 | 8 N·m (0.8 kgf·m, 5.9 lb·ft) |
| Water pump housing cover bolt | M6 | 4 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Water pump impeller | M8 | 1 | 14 N·m (1.4 kgf·m, 10 lb·ft) |
| Oil pump assembly bolt | M5 | 2 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Oil pump cover bolt | M4 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Oil strainer bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Throttle cable cover bolt | M5 | 1 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
| Throttle body joint bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Throttle body joint clamp screw | M5 | 1 | 3.0 N·m (0.30 kgf·m, 2.2 lb·ft) |
| Air filter case joint clamp screw | M5 | 1 | 3.0 N·m (0.30 kgf·m, 2.2 lb·ft) |
| Air filter case bolt | M6 | 3 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Clutch cable locknut (clutch cable adjuster) | M6 | 1 | 4.3 N·m (0.43 kgf·m, 3.2 lb·ft) |
| Clutch cable locknut (engine side) | M8 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Exhaust pipe nut | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Exhaust pipe protector screw | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Exhaust pipe bracket bolt | M8 | 1 | 20 N·m (2.0 kgf·m, 15 lb·ft) |
| Silencer bolt (front) | M8 | 1 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Silencer bolt (rear) | M8 | 1 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Exhaust pipe clamp bolt | M8 | 2 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Spark arrester bolt | M5 | 4 | 9 N·m (0.9 kgf·m, 6.6 lb·ft) |
| Silencer cap screw | M5 | 6 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Oil nozzle bolt | M5 | 1 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Engine oil drain bolt | M10 | 1 | 20 N·m (2.0 kgf·m, 15 lb·ft) |
| Crankcase bolt | M6 | 13 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Clutch cable holder bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Crankshaft end accessing screw | M36 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Timing mark accessing screw | M14 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Drive sprocket cover bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Crankcase bearing cover plate screw | M8 | 4 | 22 N·m (2.2 kgf·m, 16 lb·ft) |
| Bearing plate cover bolt (left side of the drive axle) | M6 | 2 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Plate bolt | M6 | 4 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Clutch cover bolt | M6 | 6 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Crankcase cover bolt (left) | M6 | 7 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Crankcase cover bolt (right) | M6 | 9 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Oil filter element cover bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Starter clutch screw | M6 | 8 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Primary drive gear nut | M16 | 1 | 105 N·m (10.5 kgf·m, 77 lb·ft) |
| Clutch spring bolt | M6 | 6 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Clutch boss nut | M20 | 1 | 95 N·m (9.5 kgf·m, 70 lb·ft) |
| Drive sprocket nut | M18 | 1 | 75 N·m (7.5 kgf·m, 55 lb·ft) |
| Segment bolt | M8 | 1 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Shift guide bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Stopper lever bolt | M6 | 1 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Shift pedal bolt | M6 | 1 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Generator rotor nut | M12 | 1 | 65 N·m (6.5 kgf·m, 48 lb·ft) |
| Stator coil screw | M5 | 3 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Crankshaft position sensor bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Stator coil assembly lead holder bolt | M5 | 1 | 8 N·m (0.8 kgf·m, 5.9 lb·ft) |
| Coolant temperature sensor | M10 | 1 | 15 N·m (1.5 kgf·m, 11 lb·ft) |
| Gear position switch bolt | M5 | 2 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
| Rectifier/regulator bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| ECU bolt | M5 | 2 | 3.8 N·m (0.38 kgf·m, 2.8 lb·ft) |
| Ignition coil bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Starter motor bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Nut (holder) | M6 | 1 | 8 N·m (0.8 kgf·m, 5.9 lb·ft) |
| Throttle position sensor screw | M5 | 1 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
| Intake air pressure sensor screw | M6 | 1 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
CHASSIS TIGHTENING TORQUES
| Item | Thread size | Q’ty | Tightening torques |
|---|---|---|---|
| Upper bracket pinch bolt | M8 | 4 | 21 N·m (2.1 kgf·m, 15 lb·ft) |
| Lower bracket pinch bolt | M8 | 4 | 21 N·m (2.1 kgf·m, 15 lb·ft) |
| Steering stem nut | M24 | 1 | 145 N·m (14.5 kgf·m, 107 lb·ft) |
| Upper handlebar holder bolt | M8 | 4 | 28 N·m (2.8 kgf·m, 21 lb·ft) |
| Lower handlebar holder nut | M10 | 2 | 40 N·m (4.0 kgf·m, 30 lb·ft) |
| Engine stop switch screw | M3 | 1 | 0.5 N·m (0.05 kgf·m, 0.37 lb·ft) |
| Start switch | M3 | 1 | 0.5 N·m (0.05 kgf·m, 0.37 lb·ft) |
| Lower ring nut | M28 | 1 | See TIP. |
| Damper assembly (front fork) | M51 | 2 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Inner tube and adjuster | M22 | 2 | 55 N·m (5.5 kgf·m, 41 lb·ft) |
| Base valve (front fork) | M42 | 2 | 28 N·m (2.8 kgf·m, 21 lb·ft) |
| Adjuster (damper assembly) | M12 | 2 | 29 N·m (2.9 kgf·m, 21 lb·ft) |
| Bleed screw (front fork) | M5 | 2 | 1.3 N·m (0.13 kgf·m, 0.95 lb·ft) |
| Front fork protector bolt | M6 | 6 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Speed sensor bolt | M6 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Plate bolt | M5 | 2 | 3.8 N·m (0.38 kgf·m, 2.8 lb·ft) |
| Throttle grip cap screw | M5 | 2 | 3.8 N·m (0.38 kgf·m, 2.8 lb·ft) |
| Clutch lever holder bolt | M5 | 2 | 3.8 N·m (0.38 kgf·m, 2.8 lb·ft) |
| Clutch lever nut | M6 | 1 | 4.0 N·m (0.40 kgf·m, 3.0 lb·ft) |
| Front brake master cylinder holder bolt | M6 | 2 | 9 N·m (0.9 kgf·m, 6.6 lb·ft) |
| Front brake master cylinder reservoir cap screw | M4 | 2 | 1.5 N·m (0.15 kgf·m, 1.1 lb·ft) |
| Front brake lever pivot bolt | M6 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Front brake lever pivot nut | M6 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Locknut (front brake lever position) | M6 | 1 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Front brake hose union bolt | M10 | 2 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Front brake caliper bolt | M8 | 2 | 28 N·m (2.8 kgf·m, 21 lb·ft) |
| Front brake pad pin | M10 | 1 | 17 N·m (1.7 kgf·m, 13 lb·ft) |
| Front brake pad pin plug | M10 | 1 | 2.5 N·m (0.25 kgf·m, 1.8 lb·ft) |
| Front brake caliper bleed screw | M8 | 1 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Front wheel axle nut | M18 | 1 | 115 N·m (11.5 kgf·m, 85 lb·ft) |
| Front wheel axle pinch bolt | M8 | 4 | 21 N·m (2.1 kgf·m, 15 lb·ft) |
| Front brake disc bolt | M6 | 6 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Rear brake disc bolt | M6 | 6 | 12 N·m (1.2 kgf·m, 8.9 lb·ft) |
| Footrest bracket bolt | M10 | 4 | 55 N·m (5.5 kgf·m, 41 lb·ft) |
| Sidestand bolt | M10 | 1 | 35 N·m (3.5 kgf·m, 26 lb·ft) |
| Rear brake pedal bolt | M8 | 1 | 26 N·m (2.6 kgf·m, 19 lb·ft) |
| Rear brake pedal adjusting locknut | M6 | 1 | 6 N·m (0.6 kgf·m, 4.4 lb·ft) |
| Rear brake master cylinder bolt | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Rear brake master cylinder reservoir cap bolt | M4 | 2 | 1.5 N·m (0.15 kgf·m, 1.1 lb·ft) |
| Rear brake hose union bolt | M10 | 2 | 30 N·m (3.0 kgf·m, 22 lb·ft) |
| Rear brake caliper bleed screw | M8 | 1 | 5 N·m (0.5 kgf·m, 3.7 lb·ft) |
| Rear brake pad pin | M10 | 1 | 17 N·m (1.7 kgf·m, 13 lb·ft) |
| Rear brake pad pin plug | M10 | 1 | 2.5 N·m (0.25 kgf·m, 1.8 lb·ft) |
| Rear wheel axle nut | M20 | 1 | 125 N·m (12.5 kgf·m, 92 lb·ft) |
| Drive chain puller locknut | M8 | 2 | 21 N·m (2.1 kgf·m, 15 lb·ft) |
| Rear wheel sprocket nut | M8 | 6 | 50 N·m (5.0 kgf·m, 37 lb·ft) |
| Nipple (spoke) | — | 72 | 2.5 N·m (0.25 kgf·m, 1.8 lb·ft) |
| Bolt (rear brake disc cover) | M6 | 2 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Rear brake caliper protector bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Engine mounting bolt (upper side) | M10 | 2 | 45 N·m (4.5 kgf·m, 33 lb·ft) |
| Engine mounting nut (front side) | M10 | 1 | 55 N·m (5.5 kgf·m, 41 lb·ft) |
| Engine mounting nut (lower side) | M10 | 1 | 53 N·m (5.3 kgf·m, 39 lb·ft) |
| Engine bracket bolt (upper side) | M8 | 4 | 34 N·m (3.4 kgf·m, 25 lb·ft) |
| Engine bracket bolt (front side) | M8 | 4 | 34 N·m (3.4 kgf·m, 25 lb·ft) |
| Rear frame bolt | M8 | 4 | 38 N·m (3.8 kgf·m, 28 lb·ft) |
| Engine guard bolt | M6 | 3 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Pivot shaft nut | M16 | 1 | 85 N·m (8.5 kgf·m, 63 lb·ft) |
| Rear shock absorber assembly upper nut | M10 | 1 | 56 N·m (5.6 kgf·m, 41 lb·ft) |
| Rear shock absorber assembly lower nut | M10 | 1 | 53 N·m (5.3 kgf·m, 39 lb·ft) |
| Relay arm nut (swingarm side) | M14 | 1 | 70 N·m (7.0 kgf·m, 52 lb·ft) |
| Connecting arm nut (relay arm side) | M14 | 1 | 80 N·m (8.0 kgf·m, 59 lb·ft) |
| Connecting arm nut (frame side) | M14 | 1 | 80 N·m (8.0 kgf·m, 59 lb·ft) |
| Brake hose holder screw | M5 | 4 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
| Drive chain tensioner bolt (upper side) | M8 | 1 | 16 N·m (1.6 kgf·m, 12 lb·ft) |
| Drive chain tensioner bolt (lower side) | M8 | 1 | 16 N·m (1.6 kgf·m, 12 lb·ft) |
| Bolt (drive chain support) | M6 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Drive chain support nut | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Drive chain guide bolt | M5 | 3 | 4.0 N·m (0.40 kgf·m, 3.0 lb·ft) |
| Fuel tank bolt (front side) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Fuel tank bolt (boss) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Fuel tank bolt (rear side) | M6 | 1 | 9 N·m (0.9 kgf·m, 6.6 lb·ft) |
| Fuel tank bracket bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Fuel pump bolt | M5 | 5 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Screw (fuel inlet pipe) | M5 | 2 | 3.5 N·m (0.35 kgf·m, 2.6 lb·ft) |
| Bolt (fuel tank cap cover) | M6 | 2 | 4.0 N·m (0.40 kgf·m, 3.0 lb·ft) |
| Seat set bracket screw | M6 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Seat bolt | M8 | 2 | 22 N·m (2.2 kgf·m, 16 lb·ft) |
| Side cover bolt (left) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Side cover bolt (right) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Air scoop bolt (frame) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Air scoop bolt (fuel tank) | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Air scoop bolt (radiator guard) | M6 | 4 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Front fender bolt | M6 | 4 | 10 N·m (1.0 kgf·m, 7.4 lb·ft) |
| Rear fender bolt (front side) | M6 | 4 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Rear fender bolt (rear side) | M6 | 2 | 16 N·m (1.6 kgf·m, 12 lb·ft) |
| Headlight body and headlight stay bolt | M6 | 2 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Multi-function meter screw | M5 | 2 | 1.3 N·m (0.13 kgf·m, 0.95 lb·ft) |
| Multi-function meter bracket bolt | M6 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
| Front brake hose guide and headlight stay bolt | M5 | 1 | 3.8 N·m (0.38 kgf·m, 2.8 lb·ft) |
| Screw (mud flap) | — | 2 | 1.3 N·m (0.13 kgf·m, 0.95 lb·ft) |
| Frame ground bolt (negative battery lead) | M5 | 1 | 7 N·m (0.7 kgf·m, 5.2 lb·ft) |
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