Enduro - Offroad · 2005

125 MRX 4T

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MotoLibrary Score

38 /100 Commuter

Power/Weight

0.14 hp/kg

Engine

125 ccm

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Performance & Handling Profile Versatile Everyday Motorcycle

125 MRX 4T Performance & Handling Ratings

Power

26/100

14.5 HP

Torque

27/100

~12 Nm

Agility

98/100

107 kg dry

Ergonomics

68/100

Standard

Range

70/100

~323 km (8.4L)

Tires, Oil & Maintenance Specs 2005 Factory Reference

125 MRX 4T Tire Size, Oil & Service Capacities

🛞 Front Tire Size

90/90-21

Pressure: 1.8 bar (26 psi)

🛞 Rear Tire Size

120/80-18

Pressure: 2.0 bar (29 psi)

🛢️ Engine Oil & Capacity

SAE 10W-40 4T (API SL/SN / JASO MA2)

Capacity: 1.00 litres (1.06 US quarts)

⛓️ Final Drive & Chain

Chain 428

5-speed

⚡ Spark Plugs & Battery

NGK CR8E / CPR8EA-9

Battery: 12V 6Ah / 7Ah (YTX7L-BS)

⛽ Fuel Tank & Range

8.40 litres (2.22 US gallons)

Est. Range: ~323 km (201 mi)

🔧 Printable Workshop Fluid & PSI Card →

Engine

Displacement 125.0 ccm (7.63 cubic inches)

Engine Type Single cylinder, four-stroke

Engine Details Single cylinder, four-stroke

Power 14.5 HP (10.6 kW)

Compression 10.0:1

Bore x Stroke 54.0 x 54.0 mm (2.1 x 2.1 inches)

Valves/Cylinder 2

Fuel System Carburettor. MIKUNI VM 20 SS

Fuel Control Single Overhead Cams (SOHC)

Ignition Digital transistorized (TCI / ECU)

Lubrication Mixture of gasoline and oil to 2%

Transmission

Gearbox 5-speed

Clutch Multiplate wet clutch, cable/hydraulic operated

Driveline Roller chain final drive

Chain Size 428

Chassis

Frame Type Perimetral chassis, steel.

Front Suspension Paioli

Rear Suspension Paioli

Wheelbase 1332 mm (52.4 inches)

Wheels & Brakes

Front Tyre 90/90-21

Rear Tyre 120/80-18

Front Tire Pressure 1.8 bar (26 psi)

Rear Tire Pressure 2.0 bar (29 psi)

Front Brakes Single disc

Front Brake Ø 260 mm (10.2 inches)

Rear Brakes Single disc

Rear Brake Ø 200 mm (7.9 inches)

Wheels Wire spoked wheels with aluminium rims

Dimensions & Weight

Dry Weight 107.0 kg (235.9 pounds)

Power/Weight 0.1355 HP/kg

Overall Height 1170 mm (46.1 inches)

Overall Length 2050 mm (80.7 inches)

Overall Width 800 mm (31.5 inches)

Fuel Capacity 8.40 litres (2.22 US gallons)

Oil Capacity 1.00 litres (1.06 US quarts)

Service & Fluids

Engine Oil SAE 10W-40 4T (API SL/SN / JASO MA2)

Brake Fluid DOT 4

Spark Plugs NGK CR8E / CPR8EA-9

Battery 12V 6Ah / 7Ah (YTX7L-BS)

Other

Starter Electric

Electrical 12V 6Ah / 7Ah (YTX7L-BS)

Notes

Yamaha engine.

Data-Driven Buyer Verdict Evaluated from 2005 OEM specs & class benchmarks

2005 Rieju 125 MRX 4T Pros, Cons, Recalls & Verdict

✓ Pros & Key Strengths

Verified 14.5 HP (10.6 kW) power delivery paired with a 5-speed transmission.
Manageable 116 kg (256 lbs) curb mass makes low-speed filtering and garage parking effortless.
Directly compliant with EU A2 / beginner-intermediate power limits (10.8 kW ≤ 35 kW).

! Cons & Buyer Considerations

Compact 8.40 litres (2.22 US gallons) fuel tank means more frequent refueling stops on long highway trips.
As a 2005 model-year machine, buyers should inspect rubber brake lines, charging voltage, and suspension seals closely.
Stock suspension preload and damping should be dialed in for your specific rider weight and luggage load.

🛡️ Open Full Recall & Chronic Fault Lookup → 📋 Generate Printable Pre-Purchase Checklist for 2005 125 MRX 4T →

Technical Overview

2005 Rieju 125 MRX 4T Technical Analysis, Chassis Review & Ownership Overview

Engineered by Rieju for the enduro - offroad motorcycle segment, the 2005 Rieju 125 MRX 4T relies on a 125 cc (7.6 cu in) single cylinder, four-stroke powerplant. In factory specification, peak output is rated at 14.5 HP (10.6 kW), transferring power to the rear wheel through a 5-speed transmission, a multiplate wet clutch, cable/hydraulic operated clutch. Internal cylinder geometry specifies a bore and stroke of 54.0 x 54.0 mm (2.1 x 2.1 inches), a 10.0:1 compression ratio, 2 valves per cylinder, fuel delivery managed via carburettor, Mikuni vm 20 ss. With a specific output of 116 HP per liter, the engine character reflects a performance-oriented street tune that balances strong mid-range pull with an energetic top-end rush.

On the scales, the 125 MRX 4T measures 107 kg (236 lbs) dry, translating to a power-to-weight ratio of 0.14 HP/kg (7.38 kg per horsepower). Rider ergonomics and dimensional geometry center around a 1,332 mm (52.4 in) wheelbase engineered for quick, flickable turn-in geometry. The 8.4-liter (2.2 US gal) fuel tank supports practical everyday commuting and weekend road stints.

Structurally, the 2005 Rieju 125 MRX 4T is built around a Perimetral chassis, steel chassis with front suspension handled by Paioli and rear damping managed via Paioli. Braking performance is delivered by single disc (260 mm rotor diameter) up front paired with single disc (200 mm) at the rear. Factory rolling stock mounts a 90/90-21 front tire and a 120/80-18 rear tire, sizing the contact patch for predictable turn-in grip and replacement tire availability.

From a licensing standpoint, its 10.6 kW output qualifies for European A1 and beginner motorcycle license tiers. Routine workshop maintenance calls for recommended SAE 10W-40 4T (API SL/SN / JASO MA2) engine oil (1.00 litres (1.06 US quarts)), NGK CR8E / CPR8EA-9 spark plugs, cold tire pressures of 1.8 bar (26 psi) front / 2.0 bar (29 psi) rear. Buyers cross-shopping the 2005 Rieju 125 MRX 4T in the Enduro - Offroad segment most frequently benchmark its horsepower, seat height, and curb weight against the Honda XRV 750 Africa Twin (2003), Honda XRV 750 Africa Twin (2002), Yamaha TT-R125E (2008).

Specific Output

116 HP/L

Power-to-Weight

0.14 HP/kg (7.38 kg/HP)

Tire Combination

90/90-21 / 120/80-18

About These 2005 Rieju 125 MRX 4T Specifications & Data Sources: Technical data for the 2005 Rieju 125 MRX 4T is compiled from manufacturer OEM service sheets and type-approval records by the MotoLibrary Editorial Team. Performance ratings, seat-height ergonomics, A1/A2 license eligibility, gearing speeds, and ownership cost estimates are calculated across MotoLibrary's database of 43,881+ motorcycles using power-to-weight (HP/kg) ratios and factory chassis dimensions.

✓ Verified against OEM service manuals & type-approval records

Editorial Methodology Report a Spec Correction →

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Before You Compare This Bike

Use this page to compare this motorcycle by its real specifications, not only by model name. Focus on the details that affect fit, comfort, handling, range and ownership.

Power

Compare engine output with similar motorcycles if acceleration, highway use or two-up riding matters.

Weight

Compare weight carefully because it affects low-speed handling, parking and confidence.

Fuel Capacity

Fuel capacity helps estimate touring range and how often you may need to stop.

Brakes

Brake setup is worth comparing if you ride in traffic, mountains or with a passenger.

Suspension

Suspension details can matter for comfort, road feel and long-distance riding.

Transmission

Transmission and final drive affect maintenance, smoothness and everyday usability.

Rider Profile

Who Is This Bike For?

🟢

Beginner

A2 license compatible, manageable power.

🌲

Best For

Off-Road & Adventure

⚖️

Handling

Very lightweight — easy to handle

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Seat Height & Ergonomics Seat: 800 mm (31.5 in)

125 MRX 4T Seat Height & Rider Height Fit

Rider Height 175 cm (5'9")

Leg Inseam 79 cm (31.1")

Footwear Sole:

🟢 Balls of Both Feet (Secure)

Est. Knee Angle: ~92°

Quick Height Reference (800 mm Saddle + 18 mm Seat Width Arc):

163cm (5'4")

Tip-Toe

170cm (5'7")

Balls of Feet

178cm (5'10")

Flat-Foot

185cm (6'1")

Flat-Foot

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License & Power Limit Check EU / UK A1 & CBT Eligible

125 MRX 4T A1, A2 & LAMS License Compatibility

Meets ≤125cc and ≤11 kW (15 HP) learner requirements natively.

Output (kW / HP)

10.6 kW (14.5 HP)

Power / Weight

0.093 kW/kg

LAMS Ratio

93 kW/t

🇪🇺 EU/UK A1 (≤11kW) ✓ Eligible

🇪🇺 EU/UK A2 (≤35kW) ✓ Native

🇦🇺 AU/NZ LAMS (≤150kW/t) ✓ Eligible

🌍 Unrestricted Class A ✓ All Riders

* EU Directive 2006/126/EC requires ≤35 kW (47.5 HP), ≤0.20 kW/kg wet weight, and a factory base model not exceeding 70 kW (95 HP) for A2 restriction. Always verify VIN homologation on your registration certificate.

🪪 Open Full A2 / LAMS Restrictor & Eligibility Checker →

Engine Design & Chassis Dimensions Bore/Stroke: 1:1

125 MRX 4T Engine Stroke, RPM & Steering Geometry

Mean Piston Speed (@ 8,500 RPM)

15.3 m/s (3,012 ft/min)

Low Mechanical Stress (Marathon Longevity)

Bore × Stroke Architecture

54 × 54 mm

Square Architecture (Linear Broad Torque)

Steering Rake & Trail

Standard Rake

Neutral Balanced Cornering & Highway Composure

Wheelbase & Stability

1,332 mm (52.4 in)

Compact agile chassis footprint

Engine Note: Mean piston speed (v_m = 2 × Stroke × RPM / 60) measures piston travel velocity at peak power. Values under 18.5 m/s indicate low inertial stress on connecting rods and rings; values above 21.5 m/s approach Formula 1 / MotoGP velocities.

Sprockets, Chain & Cruising RPM Base: 14T / 46T (3.29:1) · Class Ref

125 MRX 4T Sprocket Ratio, RPM & Top Speed

Front Sprocket 14T (0)

Rear Sprocket 46T (0)

Final Ratio

3.29:1

0.0% (Factory Stock)

100 / 120 km/h RPM

Top gear est.

Geared V-Max

~149 km/h

Rule of Thumb: Dropping 1 tooth in the front (-1T) equals roughly adding +2.7 to +3 teeth on the rear sprocket, boosting wheel torque by ~6–7% at the cost of higher highway cruising RPM.

⚙️ Tire Size & Speedo Error Calc → 🏁 Loaded Rider HP/kg & Drag Calc →

Tire Pressure & Suspension Travel Travel: 125mm F / 130mm R

125 MRX 4T Tire Pressure (PSI / Bar) & Suspension Sag

1. Riding Setup Mode:

2. Payload / Passenger Load:

Target Rider Sag (F / R)

38 mm Front · 39 mm Rear

Free (Static) Sag target: 10–15 mm

Cold Tire Pressure (F / R)

26 / 29 PSI

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2005 Rieju 125 MRX 4T Summary Table

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### 2005 Rieju 125 MRX 4T — Key Specs & Telemetry
| Parameter | Specification |
| :--- | :--- |
| **Category** | Enduro - Offroad |
| **Displacement** | 125.0 ccm (7.63 cubic inches) |
| **Power Output** | 14.5 HP (10.6 kW) (0.093 kW/kg) |
| **Torque** | N/A |
| **Seat Height** | 800 mm |
| **Weight (Dry / Wet)** | 107.0 kg (235.9 pounds) / 113.4 kg |
| **Mean Piston Speed** | 15.3 m/s @ 8500 RPM |
| **EU A2 License Status** | EU / UK A1 & CBT Eligible |
| **Source & Full Telemetry** | https://motolibrary.com/bikes/rieju/125-mrx-4t/2005 |

<div style="font-family:system-ui,-apple-system,sans-serif;border:1px solid #e2dfd8;border-radius:12px;padding:14px 16px;max-width:560px;background:#ffffff;color:#1a1a1a"><div style="font-weight:700;font-size:16px;margin-bottom:8px">2005 Rieju 125 MRX 4T — Technical Specs &amp; Recall Summary</div><table style="width:100%;border-collapse:collapse;font-size:13px"><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Engine / Power</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">125.0 ccm (7.63 cubic inches) · 14.5 HP (10.6 kW)</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Seat Height</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">800 mm</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">Weight (Dry / Wet)</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">107.0 kg (235.9 pounds) / 113.4 kg</td></tr><tr><td style="padding:5px 0;border-bottom:1px solid #eee;color:#666">License / Recall Audit</td><td style="padding:5px 0;border-bottom:1px solid #eee;font-weight:600;text-align:right">EU / UK A1 &amp; CBT Eligible · Check VIN / model-year recall database</td></tr></table><div style="margin-top:8px;font-size:12px;color:#666">Data source: <a href="https://motolibrary.com/bikes/rieju/125-mrx-4t/2005" style="color:#bf3b00;font-weight:600;text-decoration:none">2005 Rieju 125 MRX 4T Specs, Review &amp; Recalls — MotoLibrary</a></div></div>

Running & Fuel Cost Estimate

125 MRX 4T Annual Fuel, Maintenance & Ownership Cost

Annual km

Fuel Price ($/L)

Fuel Consumption (L/100km) — estimated

⛽ Fuel

per year

🔧 Maintenance

per year

🛡️ Insurance

per year

TOTAL

* Estimates only. Actual costs vary by country, riding habits, insurance provider and maintenance schedule.

Quick Buyer Answers

2005 Rieju 125 MRX 4T Frequently Asked Questions

Does the 2005 Rieju 125 MRX 4T have any official safety recalls?

No model-year recall summary is currently flagged in our editorial audit for the 2005 Rieju 125 MRX 4T. Always run the 17-digit steering-head VIN through NHTSA or DVSA before purchasing a used motorcycle.

What is the seat height and weight of the 2005 Rieju 125 MRX 4T?

The 2005 Rieju 125 MRX 4T has a seat height of 800 mm, a dry weight of 107.0 kg (235.9 pounds), and a wet/curb weight of 113.4 kg (estimated).

Is the 2005 Rieju 125 MRX 4T EU A2 or LAMS license legal?

License classification: EU / UK A1 & CBT Eligible. Meets ≤125cc and ≤11 kW (15 HP) learner requirements natively.

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