1981 Honda CR250 Torque Specs: Vintage MX Fastener Reference
Shop parts for a 1981 Honda CR250 Dirt Bike.
The 1981 Honda CR250 marks a pivotal step in the evolution of the CR250 line, as Honda introduced the Mono-Shock Pro-Link rear suspension system on the CR250 for this model year. This was a landmark change—moving from dual rear shocks to a single shock with linkage—that transformed the handling characteristics of the CR250. The 1981 model is a highly significant machine in Honda MX history and is well-regarded by vintage collectors. The new rear suspension system has its own unique fastener requirements compared to the earlier dual-shock models.
Suspension & Chassis
The 1981 CR250 introduces the Pro-Link monoshock rear suspension. The linkage system adds pivot bolts that require their own attention during maintenance.
| Fastener | Torque |
|---|---|
| Fork clamp bolts | 20–25 Nm (15–18 ft-lb) |
| Handlebar clamp bolts | 20–25 Nm (15–18 ft-lb) |
| Swingarm pivot bolt/nut | 55–65 Nm (41–48 ft-lb) |
| Rear shock upper mount | 30–40 Nm (22–30 ft-lb) |
| Rear shock lower mount | 30–40 Nm (22–30 ft-lb) |
| Linkage pivot bolts | 28–35 Nm (21–26 ft-lb) |
Engine Fasteners
Two-stroke premix, no oil drain plug. 1981 CR250 engine hardware:
| Fastener | Torque |
|---|---|
| Spark plug | 20–25 Nm (15–18 ft-lb) |
| Cylinder head bolts | 22–28 Nm (16–21 ft-lb) |
| Cylinder base bolts/nuts | 18–22 Nm (13–16 ft-lb) |
| Flywheel/rotor nut | 45–55 Nm (33–41 ft-lb) |
| Clutch hub nut | 45–55 Nm (33–41 ft-lb) |
Wheels & Drivetrain
| Fastener | Torque |
|---|---|
| Front axle nut | 40–50 Nm (30–37 ft-lb) |
| Rear axle nut | 65–75 Nm (48–55 ft-lb) |
| Rear sprocket nuts | 22–28 Nm (16–21 ft-lb) |
Brakes
The 1981 CR250 transitions to front disc braking. Rear drum brake retained.
| Fastener | Torque |
|---|---|
| Front caliper mounting bolts | 22–28 Nm (16–21 ft-lb) |
| Front disc bolts | 8–12 Nm (6–9 ft-lb) |
| Rear brake anchor bolt | 22–28 Nm (16–21 ft-lb) |
Pro-Link Linkage First-Service Notes
The 1981 CR250’s new Pro-Link rear suspension has multiple pivot bearings that benefit from regular inspection and re-greasing. On a 40-plus-year-old example, the original bearings may be at or well beyond their service life. Inspect the needle roller bearings in each pivot and replace them if they show wear, pitting, or corrosion. Clean, lubricate, and re-torque all linkage pivot bolts at annual service. Smooth, consistent rear suspension action on the 1981 model depends on these pivots being properly maintained.
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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.