Koso RX4 unlimited

RX-4 | Multifunction TFT Meter

The RX-4 Multifunction TFT Meter is the ultimate solution for riders looking for a modern, feature-rich, and highly legible instrument. Equipped with a speedometer, odometer, tachometer, voltmeter, A/F ratio display, clock, and stopwatch, it delivers all essential ride data at a glance.

With Bluetooth connectivity, the RX-4 goes beyond traditional meters by displaying incoming calls, music information, and more directly on its large TFT screen. Multiple display modes ensure excellent visibility and usability in all riding conditions.

Key Features & Functions

• TFT Display: High-resolution, multiple display modes

• Bluetooth: Call & music information display

• Vehicle data: Speed, RPM, temperature, voltage, fuel level

• Advanced features: Shift light, oil maintenance interval, A/F ratio monitoring

• Compatibility: iOS & Android

Technical Specifications

• Speedometer: 0–225 mph (0–360 km/h), switchable

• Odometer: up to 999,999 km

• Trip meters 1 & 2: up to 9,999.9 km

• Low fuel range: up to 999 km

• Oil maintenance interval: 300–10,000 mi (500–16,000 km) with warning

• Tachometer: 0–10,000 / 12,500 / 15,000 / 18,000 RPM

• Shift light: adjustable, 1,000–10,000 / 12,500 / 15,000 / 18,000 RPM

• Temperature: 0–250 °C (32–482 °F), overheat warning adjustable (60–250 °C)

• Voltmeter: 8.0–18.0 V, low/high voltage alerts

• Fuel gauge: 6 steps

• A/F ratio: 12.1–17.5 (requires adapter BO002001 & sensor BG000S01)

• Target functions: speed 0–360 km/h, distance 50–1,500 m

• Records: top speed, distance, time

Smartphone Connectivity

• Compatibility: iOS from v5.0, Android from v9

• Calls: iOS – name or number; Android – number only

• Online calls (LINE, WeChat, WhatsApp): iOS supported, Android not supported

• Music info (iOS): title up to 15 chars, artist up to 18 chars, total & current play time

• Info push: iOS supported

Package Contents

• LCD meter – 1×

• Main wiring harness – 1×

• Active RPM sensor – 1×

• RPM cable (Type A) – 1×

• RPM cable set (Type B) – 1×

• Sensor cable set – 1×

• Temperature sensor – 1×

• Speed sensor bracket M8 / S-Type – 1×

• Speed sensor bracket M10 / S-Type – 1×

• Hex screw M5 × 5 P0.8 – 1×

• 2.5 mm hex key – 1×

• 3 mm hex key – 1×

• Meter bracket – 1×

• Screw M5 × 12L mm – 1×

• Washer M5 – 1×

• Screw M6 × 35L – 1×

• Screw M8 × 30L – 1×

• Spacer M6 – 1×

• Spacer M8 – 1×

• Bushing M6 – 1×

• Bushing M8 – 1×