2017 Beta 390 RR-S Dirt Bike Torque Specs
Shop parts for a 2017 Beta 390 RR-S Dirt Bike.
The 2017 Beta 390 RR-S launches a new mid-displacement option in Beta’s dual-sport lineup. The 389cc liquid-cooled DOHC four-valve single with electronic fuel injection and six-speed gearbox pairs with DOT-compliant lighting, mirrors, horn, and turn signals for street legality. The 390 RR-S shares the new chrome-moly steel frame, KYB 48mm fork, and Sachs rear shock with the enduro model but features softer suspension settings for mixed trail and road use. The extra torque from the 390’s displacement over the 350 makes the dual-sport more capable on highway stretches and steep fire roads — the additional power is particularly welcome when carrying the weight of street equipment.
Engine Torque Specifications
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Spark Plug | 12 | 9 |
| Cylinder Head Bolts | 45 | 33 |
| Cylinder Base Bolts | 25 | 18 |
| Valve Cover Bolts | 10 | 7 |
| Cam Sprocket Bolts | 12 | 9 |
| Oil Drain Plug | 20 | 15 |
| Oil Filter Cover Bolts | 10 | 7 |
| Flywheel/Rotor Nut | 75 | 55 |
| Clutch Hub Nut | 75 | 55 |
Chassis & Suspension
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Swingarm Pivot Bolt | 70 | 52 |
| Lower Triple Clamp Pinch Bolts | 12 | 9 |
| Upper Triple Clamp Pinch Bolts | 20 | 15 |
| Handlebar Clamp Bolts | 15 | 11 |
| Shock Upper Mount | 50 | 37 |
| Shock Lower Mount | 50 | 37 |
| Linkage Bolts | 40 | 30 |
| Subframe Bolts | 25 | 18 |
| Engine Mount Bolts | 45 | 33 |
Drivetrain & Wheels
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Front Axle Nut | 50 | 37 |
| Rear Axle Nut | 100 | 74 |
| Front Sprocket Bolt | 50 | 37 |
| Rear Sprocket Nuts | 30 | 22 |
| Chain Adjuster Lock Nuts | 18 | 13 |
Brakes
| Fastener | Torque (Nm) | Torque (ft-lbs) |
|---|---|---|
| Front Caliper Bolts | 30 | 22 |
| Rear Caliper Bolts | 25 | 18 |
| Front Disc Bolts | 10 | 7 |
| Rear Disc Bolts | 10 | 7 |
| Front Master Cylinder Clamp | 10 | 7 |
| Rear Master Cylinder Mount | 10 | 7 |
Dry vs. Wet Torque
Oil drain plug: always wet; reduce 15–20% with sealant. All other values assume dry threads.
Dual-Sport Loading Patterns
The 390 RR-S faces a unique combination of loading: highway vibration from extended pavement transit, followed by trail impacts and technical riding. Road use generates sustained high-frequency vibration that loosens fasteners differently than trail impacts. The 390’s mid-displacement engine provides enough vibration at highway RPM to affect mirror mounts, lighting brackets, and other street equipment. Check DOT equipment mounting hardware alongside standard chassis verification after mixed road and trail rides.
Thread Locker Recommendations
Medium-strength (blue) thread locker for the 2017 Beta 390 RR-S:
- Rear sprocket nuts
- All disc bolts
- Linkage bolts
- Subframe bolts
- Exhaust header bolts
- Mirror mount bolts
- Lighting bracket bolts
Torque Wrench Selection
A 3/8-inch drive click-type for 20–100 Nm and a 1/4-inch drive for 10–12 Nm hardware. Two drive sizes for the new 390cc dual-sport.
Related Shopping Categories
Shop Torque Wrenches for a 2017 Beta 390 RR-S Dirt Bike.
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Shop Thread Locker for a 2017 Beta 390 RR-S Dirt Bike.
Shop Additional Tools for a 2017 Beta 390 RR-S Dirt Bike.
Shop Penetrating Oil for a 2017 Beta 390 RR-S 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.
