What Are the Torque Specs for a 2020 Honda CRF450RX?
Shop parts for a 2020 Honda CRF450RX Dirt Bike.
The 2020 Honda CRF450RX received the 2020 CRF450R chassis update—including the revised frame with updated flex characteristics—combined with the updated airbox and fuel injection system. For the RX, these chassis changes translated directly into improved cross-country performance in technical terrain where the revised frame flex behavior made the bike more predictable through root-covered sections and rocky terrain. Understanding the updated fastener specifications that came with the 2020 platform ensures these improvements are preserved through proper maintenance.
Engine and Drivetrain Fasteners
The 2020 CRF450RX updated airbox mounting system introduced intake tract fastener changes carried from the 2020 CRF450R. On the RX specifically, the larger fuel tank and enduro accessories mean that access to some intake fasteners requires removing more components than on the motocross CRF450R—but the torque values themselves remain consistent with the standard 2020 platform.
| Engine Component | Torque Spec |
|---|---|
| Spark plug | 18–22 Nm (13–16 ft-lb) |
| Oil drain plug | 29–35 Nm (21–26 ft-lb) |
| Cylinder head bolts (8mm) | 40–48 Nm (30–35 ft-lb) |
| Cylinder head bolts (6mm) | 12–15 Nm (9–11 ft-lb) |
| Cam sprocket bolt | 35–45 Nm (26–33 ft-lb) |
| Flywheel bolt | 85–100 Nm (63–74 ft-lb) |
| Clutch hub nut | 85–100 Nm (63–74 ft-lb) |
Suspension and Chassis
The revised frame flex on the 2020 CRF450RX creates a different swingarm-to-frame interaction compared to the 2019 model. This makes swingarm pivot torque particularly important to verify after any rear suspension service on the 2020 RX—the pivot preload affects how the revised frame flex communicates with the swingarm during fast terrain changes.
| Suspension & Chassis Component | Torque Spec |
|---|---|
| Upper fork clamp bolts | 20–25 Nm (15–18 ft-lb) |
| Lower fork clamp bolts | 20–25 Nm (15–18 ft-lb) |
| Handlebar clamp bolts | 20–25 Nm (15–18 ft-lb) |
| Swingarm pivot nut | 88–108 Nm (65–80 ft-lb) |
| Rear shock upper mount | 40–50 Nm (30–37 ft-lb) |
| Rear shock linkage bolts | 40–50 Nm (30–37 ft-lb) |
Drivetrain and Brake Torque
| Drivetrain Component | Torque Spec |
|---|---|
| Front axle nut | 59–69 Nm (44–51 ft-lb) |
| Rear axle nut | 88–108 Nm (65–80 ft-lb) |
| Rear sprocket nuts | 35–45 Nm (26–33 ft-lb) |
| Chain adjuster lock nuts | 22–26 Nm (16–19 ft-lb) |
| Brake Component | Torque Spec |
|---|---|
| Front caliper mounting bolts | 28–34 Nm (21–25 ft-lb) |
| Rear caliper mounting bolts | 22–26 Nm (16–19 ft-lb) |
| Front brake disc bolts | 20–24 Nm (15–17 ft-lb) |
| Rear brake disc bolts | 20–24 Nm (15–17 ft-lb) |
Related Shopping Categories
Shop Torque Wrenches for a 2020 Honda CRF450RX Dirt Bike.
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Shop Penetrating Oil for a 2020 Honda CRF450RX Dirt Bike.
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.
