RR RACE
4T 390

The RR Race 390 4T is the perfect balance between agility and power. Smooth, manageable and always ready to deliver traction, it is the ideal choice for those looking for a four-stroke capable of adapting to any scenario: from slow and slippery technical terrain to fast and flowing trails.

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385,6 cc

Displacement

88 x 63,4 mm

Bore x stroke

950 mm

Seat height

107,5 kg

Dry weight

MAIN FEATURES

ENGINE

Traction and smoothness

The 390 4T single-cylinder engine has been remapped to deliver more linear and usable power across the entire rev range. Its distinctive feature is its ability to transfer power to the ground with continuity, ensuring stability and control even on the most treacherous surfaces such as mud, technical climbs or slippery terrain, thanks to the excellent torque values delivered even at low revs.

Compact and lightweight frame

The molybdenum steel frame with micro-cast integrated into the headstock ensures rigidity and stability, keeping the bike light and easy to handle even in the tightest and most technical sections.

Kayaba AOS fork

Kayaba AOS closed cartridge fork, ø 48 mm has anodised internal parts and specific treatments that minimise friction. Compression and rebound adjustments allow you to always find the ideal setting.

Front wheel axle

Red anodised quick release front axle: essential for replacing the wheel in a matter of seconds and gaining precious seconds in the race.

Kayaba C46 RCU Mono

Fully customisable monoshock with external compression (high and low speed) and rebound adjustments. A benchmark for consistent performance and traction even in the most demanding conditions.

Ergal footpegs

Ergal racing footpegs with interchangeable steel pins. Narrower to facilitate foot movement, they offer superior grip for maximum control and feel with the bike.

Chain tensioners in red Ergal alloy

Anodised Ergal chain tensioner: lightweight, stable and reliable, it guarantees constant chain tension and greater reliability in enduro competitions.

Racing design

An aggressive and unmistakable look: the dedicated livery enhances the Race character with bold lines and exclusive colours, recalling the factory soul of Beta and making you stand out on the track.

HANDLEBAR MAP SWITCH

The map switch button located on the handlebar allows you to select two engine maps: Full Power, which offers all the power and responsiveness of the engine, and Soft, which softens the power delivery, making it more manageable on slippery surfaces or when greater traction is needed. The same button is also used to select the level of Traction Control intervention.

Total balance on any terrain

The 390 is designed to always offer the right mix of handling and power. Kayaba racing suspension, compact vehicle and new maps make riding smooth and intuitive. Stability, safety and immediate confidence make the 390 the perfect companion for those who want to pick up the pace without sacrificing control.

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manual brochure Tech Specs

CHASSIS

FRAME

Molybdenum steel with double cradle split above the exhaust port

WHEELBASE

1476 mm

MAX LENGHT

2180 mm

MAX WIDTH

830 mm

MAX WIDTH

1275 mm

SEAT HEIGHT

950 mm

GROUND CLEARANCE

335 mm

FOOTREST HEIGHT

427 mm

DRY WEIGHT

107,5 kg (front 52,7 kg; rear 54,8 kg)

FUEL TANK CAPACITY

9,0 l

RESERVE

2,3 l

COOLING SYSTEM CAPACITY

1,4 l

FRONT SUSPENSION

Hydraulic usd fork with Ø 48 mm shaft

REAR SUSPENSION

Monoshock with progressive compound lever

SHOCK ABSORBER STROKE

130 mm

FRONT WHEEL TRAVEL

300 mm

rear WHEEL TRAVEL

287 mm

FRONT BRAKE

Wave disc Ø260 mm and double-piston floating caliper

rear brake

Wave disc Ø240 mm and single-piston floating caliper

front rim

21 x 1,6 – 36 holes

rear rim

18 x 1,85 – 36 holes

front tyre

90/90 – 21

rear tyre

140/80 -18

engine

type

Single cylinder, 4-stroke, liquid-cooled

bore

88 mm

stroke

63,4 mm

displacement

385,6 cc

compression ratio

12,48:1

valve train

Dohc finger follower / 4 titanium valve

starter

Electric

acg

Kokusan

spark plug

NGK LKAR 8A-9

lubrication

2 oil pumps

fuel system

Elldor dual electronic injection

throttle body

Ø 42 mm – Synerject

clutch

Wet multi-disc clutch

primary drive

Z.23/76

transmission

6 gears

FINAL TRANSMISSION

Chain

engine oil

SAE 10W/50 0,8 l. + SAE 10W/40 0,8 l.

consumption l/100km

3,3

pollution Co2 [g/km]

79

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