1990 Honda CR250 Torque Specs: MX Fastener Reference
Shop parts for a 1990 Honda CR250 Dirt Bike.
The 1990 Honda CR250 opens the new decade with a refined 250cc two-stroke platform that continues the development trajectory of the late 1980s. Honda updated the engine and chassis for 1990 to maintain the CR250’s competitive position, and the model is well-regarded for its handling and power delivery. Whether ridden in competition or for recreation, the 1990 CR250 performs best when all fastener torques are correctly maintained. This guide covers the key fastener systems.
Engine Fasteners
Two-stroke premix, no oil drain plug. 1990 CR250 engine hardware:
| Fastener | Torque |
|---|---|
| Spark plug | 20–25 Nm (15–18 ft-lb) |
| Cylinder head bolts | 25–30 Nm (18–22 ft-lb) |
| Cylinder base bolts/nuts | 18–22 Nm (13–16 ft-lb) |
| Flywheel/rotor nut | 48–58 Nm (35–43 ft-lb) |
| Clutch hub nut | 50–60 Nm (37–44 ft-lb) |
Suspension & Chassis
| Fastener | Torque |
|---|---|
| Fork clamp bolts (upper) | 22–28 Nm (16–21 ft-lb) |
| Fork clamp bolts (lower) | 22–28 Nm (16–21 ft-lb) |
| Handlebar clamp bolts | 22–28 Nm (16–21 ft-lb) |
| Swingarm pivot bolt/nut | 65–75 Nm (48–55 ft-lb) |
| Rear shock upper mount | 35–45 Nm (26–33 ft-lb) |
| Rear shock lower mount | 35–45 Nm (26–33 ft-lb) |
| Linkage pivot bolts | 30–38 Nm (22–28 ft-lb) |
Wheels & Drivetrain
| Fastener | Torque |
|---|---|
| Front axle nut | 40–50 Nm (30–37 ft-lb) |
| Rear axle nut | 70–80 Nm (52–59 ft-lb) |
| Rear sprocket nuts | 25–30 Nm (18–22 ft-lb) |
Brakes
Front disc and rear drum on the 1990 CR250.
| Fastener | Torque |
|---|---|
| Front caliper mounting bolts | 25–30 Nm (18–22 ft-lb) |
| Front disc bolts | 8–12 Nm (6–9 ft-lb) |
| Rear brake anchor bolt | 22–28 Nm (16–21 ft-lb) |
Top-End Service Cycle for the CR250
For the 1990 CR250 used in motocross competition, a typical top-end service interval is 10–15 hours. During each top-end service, replace the cylinder head gasket and base gasket—never reuse two-stroke gaskets. Torque the cylinder head bolts in a cross pattern in two passes: first to 50% of spec, then to full torque. After the first ride following reassembly, allow the engine to cool fully and re-check the head bolt torque to account for gasket settling. This re-torque step takes 10 minutes and prevents the most common cause of head gasket failure on two-stroke MX engines.
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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.
