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← Junak
Naked bike · 2020

125 Racer

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MotoLibrary Score
36 /100 Commuter
Power/Weight
0.08 hp/kg
Top Speed
90 km/h
Engine
125 ccm

2020 Junak 125 Racer Technical Analysis & Specification Breakdown

Built around Junak's naked motorcycle platform, the 2020 Junak 125 Racer pairs a 125 cc (7.6 cu in) single cylinder, four-stroke architecture with road-focused gearing. In factory specification, peak output is rated at 10.7 HP (7.8 kW) at 8,500 rpm, transferring power to the rear wheel through a 6-speed gearbox and shaft drive (cardan) final drive. With a specific output of 85.6 HP per liter, the engine character is indicating a tractable, stress-free state of tune focused on everyday usability and broad torque delivery.

On the scales, the 125 Racer measures 130 kg (287 lbs) dry, translating to a power-to-weight ratio of 0.08 HP/kg (12.15 kg per horsepower). Rider ergonomics and chassis geometry center around a 780 mm (30.7 in) seat height — offering a neutral standover height that accommodates most average-inseam riders without sacrificing cornering clearance. The 20-liter (5.3 US gal) fuel tank supports practical everyday commuting and weekend road stints, while factory top speed is listed at 90 km/h (56 mph).

Specific Output
85.6 HP/L
Power-to-Weight
0.08 HP/kg (12.15 kg/HP)
Standover Height
780 mm (30.7 in)
Engine
Displacement 125.0 ccm (7.63 cubic inches)
Engine Type Single cylinder, four-stroke
Power 10.7 HP (7.8 kW)) @ 8500 RPM
Valves/Cylinder 2
Fuel System Injection
Fuel Control Overhead Cams (OHC)
Ignition Digital transistorized (TCI / ECU)
Lubrication Wet sump forced lubrication
Transmission
Gearbox 6-speed
Final Drive Shaft drive (cardan) (final drive)
Clutch Multiplate wet clutch, cable/hydraulic operated
Driveline Shaft drive (cardan)
Performance
Top Speed 90.0 km/h (55.9 mph)
Chassis
Front Suspension Telescopic fork
Rear Suspension Swingarm with monoshock
Wheels & Brakes
Front Tyre 90/90-17
Rear Tyre 130/70-17
Front Tire Pressure 1.8 bar (26 psi)
Rear Tire Pressure 2.0 bar (29 psi)
Front Brakes Single disc
Rear Brakes Single disc
Wheels Cast aluminium alloy rims
Dimensions & Weight
Dry Weight 130.0 kg (286.6 pounds)
Power/Weight 0.0825 HP/kg
Seat Height 780 mm (30.7 inches) If adjustable, lowest setting.
Overall Height 1080 mm (42.5 inches)
Overall Length 1928 mm (75.9 inches)
Overall Width 766 mm (30.2 inches)
Fuel Capacity 20.00 litres (5.28 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 & kick
Color Options White/Red, Black/Green, Orange/Black
Electrical 12V 6Ah / 7Ah (YTX7L-BS)
Notes

Polish Brand

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Buying Checklist

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.
Seat Height
Check the seat height against your inseam and riding posture before choosing a motorcycle.
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
City & Weekend Rides
📏
Seat Height
78 cm / 30.7 in
⚖️
Handling
Manageable weight for most riders
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