2017 Yamaha TTR50 Dirt Bike Torque Specs
Shop parts for a 2017 Yamaha TTR50 Dirt Bike.
The 2017 Yamaha TTR50 is a 49cc four-stroke beginner motorcycle designed for very young riders taking their first steps in off-road riding. It features automatic transmission, electric start, an adjustable throttle limiter, and a low 515mm seat height that builds confidence in developing riders. The TTR50 is designed with parental peace of mind as a core design criterion — the throttle limiter allows parents to limit top speed as skills develop. Correct fastener torque is essential for safe operation.
Engine Torque Specifications
The 49cc single-cylinder engine is small by design. All engine fasteners use fine thread pitches at low torque values — a precision low-range torque wrench is essential. Do not use a full-size wrench on TTR50 engine fasteners. New base and head gaskets must be used at each removal.
| Fastener | Torque Specification | Notes |
|---|---|---|
| Spark plug | 13 – 18 Nm (10 – 13 ft-lb) | Seat by hand; anti-seize on aluminum heads |
| Cylinder head bolts | 10 – 15 Nm (7 – 11 ft-lb) | Multiple-pass crisscross sequence; new gasket each removal |
| Flywheel rotor bolt | 45 – 65 Nm (33 – 48 ft-lb) | Thread locker; holding tool required |
| Oil drain plug | 20 – 25 Nm (15 – 18 ft-lb) | New crush washer each service |
Drivetrain & Wheel Torque Specifications
Chain tension and axle hardware must be checked before each riding session. The TTR50’s low weight makes chain slack changes more noticeable and potentially more dangerous if neglected. Verify sprocket bolt torque at each service.
| Fastener | Torque Specification | Notes |
|---|---|---|
| Front axle nut | 35 – 50 Nm (26 – 37 ft-lb) | Inspect threads; verify correct seating |
| Rear axle nut | 50 – 65 Nm (37 – 48 ft-lb) | Verify chain alignment before final torque |
| Rear sprocket bolts | 25 – 35 Nm (18 – 26 ft-lb) | Medium-strength thread locker |
Suspension & Chassis Torque Specifications
The TTR50 uses conventional telescopic forks and a monoshock rear. Swingarm pivot torque is especially important on this machine — proper bearing function is critical for safe handling by young developing riders.
| Fastener | Torque Specification | Notes |
|---|---|---|
| Fork clamp bolts | 15 – 20 Nm (11 – 15 ft-lb) | Lower clamps before upper clamps |
| Handlebar clamp bolts | 20 – 25 Nm (15 – 18 ft-lb) | Even torque; center position before torquing |
| Swingarm pivot bolt | 50 – 65 Nm (37 – 48 ft-lb) | Grease bearings; verify free rotation after tightening |
Brake System Torque Specifications
| Fastener | Torque Specification | Notes |
|---|---|---|
| Brake caliper bolts | 20 – 30 Nm (15 – 22 ft-lb) | Check pad clearance after torquing |
| Brake disc bolts | 12 – 18 Nm (9 – 13 ft-lb) | Thread locker; star pattern |
Dry vs. Wet Torque
All values are dry torque specifications for clean, unlubricated threads. Apply grease to swingarm pivot bearing surfaces (not bolt threads) before assembly, target the lower end of the range, and confirm free rotation.
Thread Locker Guide
- Medium-strength (blue): sprocket bolts, brake disc bolts, flywheel bolt
- No thread locker: cylinder head bolts, axle hardware, fork clamp bolts, handlebar clamps
- Anti-seize: exhaust header bolts on high-heat applications only
Torque Wrench Selection
A click-type wrench in the 10–60 Nm range covers all major fasteners on this machine. Calibrate annually. A beam-type wrench is acceptable for low-criticality chassis fasteners.
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Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.