2025 Cobra CX50SR Dirt Bike Torque Specs
Shop parts for a 2025 Cobra CX50SR Dirt Bike.
The 2025 Cobra CX50SR delivers Standard Race 50cc competition in the most current specification, eighteen years after the SR nameplate first appeared. The air-cooled 50cc two-stroke in the competition chassis continues its role as the accessible entry point for young competitors choosing Cobra’s lineup. Eighteen years of Standard Race development reflect in a machine where every specification decision has been revisited and validated multiple times over. The 2025 SR is the most thoroughly refined version of the Standard Race concept — the accessible performance gateway that has served youth motocross competition for nearly two decades remains as relevant as ever for the current generation of young competitors entering the 50cc class.
Engine Torque Specifications
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Spark Plug | 12 | 9 |
| Cylinder Head Nuts | 8 | 6 |
| Cylinder Base Nuts | 8 | 6 |
| Flywheel/Rotor Nut | 25 | 18 |
| Clutch Hub Nut | 20 | 15 |
| Exhaust Flange Nuts | 8 | 6 |
Chassis & Suspension
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Swingarm Pivot Bolt | 22 | 16 |
| Fork Clamp Bolts | 8 | 6 |
| Handlebar Clamp Bolts | 8 | 6 |
| Shock Upper Mount | 18 | 13 |
| Shock Lower Mount | 18 | 13 |
| Subframe Bolts | 10 | 7 |
| Engine Mount Bolts | 15 | 11 |
Wheels & Drivetrain
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Front Axle Nut | 18 | 13 |
| Rear Axle Nut | 28 | 21 |
| Rear Sprocket Nuts | 12 | 9 |
| Chain Adjuster Lock Nuts | 8 | 6 |
Brakes
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Front Caliper Bolts | 10 | 7 |
| Rear Caliper Bolts | 10 | 7 |
| Disc Bolts | 6 | 4 |
Standard Race Notes
Premix two-stroke — no oil drain plug. Eighteen years of validated specifications; maintain them exactly. A 1/4-inch drive wrench for engine hardware; 3/8-inch drive for chassis fasteners.
Thread Locker Recommendations
- Rear sprocket nuts
- Disc bolts
- Subframe bolts
- Exhaust flange nuts
Torque Wrench Selection
A 1/4-inch drive click-type for engine fasteners and a 3/8-inch drive for chassis hardware. Eighteen years of Standard Race development is preserved by calibrated maintenance at every service interval.
Related Shopping Categories
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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.