What Are the Torque Specs for a 2018 Honda CRF450RX?
Shop parts for a 2018 Honda CRF450RX Dirt Bike.
The 2018 Honda CRF450RX carried forward the cross-country enduro platform introduced in 2017 with refined suspension calibration and updated fueling maps. The 449cc unicam engine, 18-inch rear wheel, enduro fuel tank, and competition off-road chassis remained consistent with the 2017 model, making the 2018 CRF450RX torque specifications closely aligned with the original year while incorporating the suspension hardware updates introduced on the 2018 CRF450R platform.
Drivetrain Torque Specs
The 18-inch rear wheel on the 2018 CRF450RX uses a rear axle nut and sprocket carrier setup that is shared with the enduro-spec platform. Chain tension management on the 2018 RX is slightly more demanding than on the motocross version because the enduro gearing and 18-inch wheel combination puts different chain loading patterns on the adjuster system. Inspect chain adjuster lock nuts after every full enduro race day.
| 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) |
Engine Fasteners
The 2018 CRF450RX engine received the same updated fuel mapping as the 2018 CRF450R. On the RX specifically, the larger fuel tank and enduro fuel system add mass and complexity to the area above the engine. When servicing the top end, the fuel tank and subframe must be moved to access the valve cover—always retorque cam cover bolts fully after reassembly rather than trusting that “snug” is sufficient.
| 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 Brake Torque
| 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) |
| 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 2018 Honda CRF450RX Dirt Bike.
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Shop Penetrating Oil for a 2018 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.
