2015 Beta 390 RS Dirt Bike Torque Specs
Shop parts for a 2015 Beta 390 RS Dirt Bike.
The 2015 Beta 390 RS brings the mid-displacement four-stroke to Beta’s road-sport lineup. The 389cc liquid-cooled DOHC four-valve single with electronic fuel injection and six-speed gearbox pairs with 17-inch road wheels, road tires, and DOT-compliant street equipment. The steel frame and road-tuned suspension settings create a road-sport machine with more torque than the 350 RS. The 390’s extra displacement provides better highway cruising capability and stronger acceleration for overtaking. Road-sport use subjects the 390 RS to sustained high-speed loading, repeated hard braking, and high-frequency pavement vibration — patterns that differ fundamentally from the enduro models sharing the same engine.
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 |
Wheels & Drivetrain
| 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. Road-sport riders accumulate oil change mileage quickly, making drain plug thread care essential. All other values assume dry threads.
Road-Sport Loading
The 390 RS’s road-sport use creates sustained thermal loading at highway speeds that the enduro models rarely encounter. The 390’s mid-displacement engine generates enough vibration at sustained RPM to affect fastener retention over long road rides. Check engine mount, handlebar clamp, and mirror mount hardware at mileage-based intervals — the 390 RS accumulates miles faster than any Beta trail model.
Thread Locker Recommendations
Medium-strength (blue) thread locker for the 2015 Beta 390 RS:
- Rear sprocket nuts
- All disc bolts
- Linkage bolts
- Subframe bolts
- Exhaust header bolts
- Mirror mount 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 390cc road-sport.
Related Shopping Categories
Shop Torque Wrenches for a 2015 Beta 390 RS Dirt Bike.
Shop Wrenches and Sockets for a 2015 Beta 390 RS Dirt Bike.
Shop Thread Locker for a 2015 Beta 390 RS Dirt Bike.
Shop Additional Tools for a 2015 Beta 390 RS Dirt Bike.
Shop Penetrating Oil for a 2015 Beta 390 RS 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.
