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2021 BMW C 400X Overview
The 2021 BMW C 400X is a scooter motorcycle built around 350 cc of displacement. Under the tank sits a Single cylinder, four-stroke engine running Overhead Cams (OHC) valve actuation, a compression ratio of 11.5:1. 2021 BMW C 400X delivers 25 kW @ 7500 rpm of peak power and 35 Nm @ 5750 rpm of torque. The factory-quoted top speed stands at 139 km/h, making it a capable performer in its class. From a practical standpoint, the 2021 C 400X tips the scales at 206 kg, carries a 12.8-litre fuel tank, offers a seat height of 775 mm and spans a 1564.5 mm wheelbase. Scroll down for the complete 2021 BMW C 400X spec sheet covering every technical detail from suspension travel to tyre sizes.
2021 C 400X - Pros & Cons
Strengths
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Strong power output: 2021 BMW C 400X makes 25 kW @ 7500 rpm with 35 Nm @ 5750 rpm of torque - competitive figures for its class.
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Fuel injection: The Electronic intake pipe fuel injection/digital engine management: BMS-ME with e-throttle grip system delivers crisp throttle response and reliable cold starts regardless of altitude or temperature.
Considerations
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Chain final drive upkeep: Chain final drive needs regular cleaning, lubrication and tension checks to get full life out of the sprockets.
Wear Points & Servicing Notes
Cooling system servicing
The Liquid cooled system on the C 400X needs a coolant change roughly every two years (or per the service schedule) - skipping it lets the coolant turn acidic and corrode the aluminium water passages over time.
Fuelling & injector care
Fuelling comes from Electronic intake pipe fuel injection/digital engine management: BMS-ME with e-throttle grip. Systems like this are largely maintenance-free beyond keeping fuel quality decent and injectors clear - a fuel-system cleaner every service interval is cheap insurance.
Brake disc and pad wear
The 2x 265mm Rigid discs, 4 piston caliper front brake gives strong, progressive stopping power. Disc thickness and pad depth are worth checking at every tyre change, since worn pads can score the disc surface.
Suspension condition on used examples
Up front, the C 400X runs 35mm Telescopic forks and Double Aluminum swingarm, double spring struts, adjustable preload at the rear. On a used example, check fork seals for weeping oil and test the rear linkage for play - seals are a relatively cheap fix but useful when negotiating price.
Final drive maintenance
Final drive is by chain - expect to clean and lube it every few hundred kilometres and check tension regularly; a neglected chain wears the sprockets faster than the chain itself.
Frame & chassis check
The frame is Steel tube construction with aluminum die cast unit - worth a visual check for corrosion or impact damage around the head-stock and swingarm pivot on any used example, since frame damage is far costlier to fix than any service item.
C 400X - Buying & Maintenance Guide
What to check before buying
When inspecting a used 2021 BMW C 400X, start with the basics: check the service book for oil change frequency, inspect the chain and sprockets for wear, and look for oil seepage around the engine casings and rocker covers. A cold start test is invaluable - a well-maintained C 400X should fire up cleanly and settle to a smooth idle within a few seconds.
Oil and filter changes
Regular oil changes are the single most important maintenance task on any C 400X. Stick to the manufacturer's interval - typically every 6,000 km or once a year, whichever comes first. Always use the correct viscosity grade as specified in the owner's manual.
Fuel system care
The C 400X's fuel injection system is durable but benefits from quality fuel and the occasional use of a fuel-system cleaner additive. If the bike has been stored for more than three months, drain and replace the fuel to prevent varnish deposits in the injectors.
2021 BMW C 400X - Frequently Asked Questions
What engine does the 2021 BMW C 400X have?
The 2021 BMW C 400X uses a Single cylinder, four-stroke engine with 350 cc of displacement. It is liquid cooled.
What is the top speed of the 2021 BMW C 400X?
The 2021 BMW C 400X has a factory-quoted top speed of 139 km/h. Real-world speeds vary depending on rider weight, conditions and state of tune.
How much does the 2021 BMW C 400X weigh?
The 2021 BMW C 400X weighs 206 kg. This is the manufacturer's wet figure.
How much power does the 2021 BMW C 400X make?
The 2021 BMW C 400X produces 25 kW @ 7500 rpm of power and 35 Nm @ 5750 rpm of torque. These are peak figures.
What is the fuel tank capacity of the 2021 BMW C 400X?
The 2021 BMW C 400X has a 12.8-litre fuel tank. At around 5-6 litres per 100 km, that is roughly 213-256 km between stops.
Is the 2021 BMW C 400X suitable for shorter riders?
The 2021 BMW C 400X has a seat height of 775 mm. This is a moderate seat height that suits a wide range of rider heights.
What brakes does the 2021 BMW C 400X have?
The 2021 BMW C 400X uses 2x 265mm Rigid discs, 4 piston caliper at the front and Single 265mm disc, 1 piston floating caliper at the rear.
What tyre sizes does the 2021 BMW C 400X use?
The 2021 BMW C 400X runs 120/70 R15 front and 150/70 R14 rear tyres. A good selection of sport, touring and all-weather rubber is available in these sizes.
What gearbox does the 2021 BMW C 400X have?
The 2021 BMW C 400X is fitted with a Stepless CVT gearbox transmission.
BMW C 400X Spec Evolution
The BMW C 400X was produced across 5 model years (2019-2025). The table below highlights the key specifications that changed across the production run - useful whether you are comparing years or tracking down a specific variant.
| Specification |
2019 |
2020 |
2021 |
2023 |
2025 |
| Max Power |
25.3 kW / 34 hp @ 7500 rpm |
25.3 kW / 34 hp @ 7500 rpm |
25 kW / 33.5 hp @ 7500 rpm |
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25 kW / 33.5 hp @ 7500 rpm |
| Wet Weight |
204.0 kg / 449.7 lbs |
204 kg / 450 lbs |
206 kg / 454.1 lbs |
204.0 kg / 449.7 lbs |
208 kg / 458.6 lbs |
| Dry Weight |
193 kg / 425.5 lbs |
193 kg / 425.5 lbs |
195 kg / 429.9 lbs |
193 kg / 425.5 lbs |
197 kg / 434.3 lbs |
| Top Speed |
139.0 km/h / 86.4 mph |
139.0 km/h / 86.4 mph |
139.0 km/h / 86.4 mph |
153.0 km/h / 95.1 mph |
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| Seat Height |
775 mm / 30.5 in. |
775 mm / 30.5 in |
775 mm / 30.5 in |
775 mm / 30.5 in. |
775 mm / 30.1 in |
| Fuel Capacity |
12.8 Litres / 3.4 US gal |
12.8 Litres / 3.4 US gal |
12.8 Litres / 3.4 US gal |
12.80 litres / 3.38 US gallons |
12.8 Litres / 3.4 US gal |
| Comments |
Windscreen. |
- |
Automatic Stability Control |
Automatic Stability Control |
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| Frame Type |
Tubular spaceframe |
Tubular spaceframe |
Steel tube construction with aluminum die cast unit |
Tubular steel with die-cast aluminum sections |
Steel bridge-type frame |
Key Specifications
Engine
Single cylinder, four-stroke
Power
25 kW / 33.5 hp @ 7500 rpm
Torque
35 Nm / 25.8 lb-ft @ 5750 rpm
Top Speed
139.0 km/h / 86.4 mph
Weight
206 kg / 454.1 lbs
Fuel Capacity
12.8 Litres / 3.4 US gal
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Full 2021 BMW C 400X Specifications
Comments
Automatic Stability Control
Year
2021
Colours
Granite grey metallic, Black storm metallic/Racing blue metallic, Black storm metallic
Make Model
BMW C 400X
Warranty
3 years
Seat Height
775 mm / 30.5 in
Wheelbase
1564.5 mm / 61.6 in
Height
1305 mm / 51.3 in
Length
2210 mm / 87 in
Width
835 mm / 32.9 in
Dry Weight
195 kg / 429.9 lbs
Fuel Capacity
12.8 Litres / 3.4 US gal
Wet Weight
206 kg / 454.1 lbs
CO2
81.2 CO2 g/km. (CO2 - Carbon dioxide emission)
Fuel Control
Overhead Cams (OHC)
Engine Type
Single cylinder, four-stroke
Displacement
350 cc / 21.3 cu-in
Engine Detail
Four stroke, single cylinder, SOHC, 4 valves, with rocker arm
Fuel System
Injection
Bore x Stroke
80 x 69.6 mm
Compression Ratio
11.5:1
Cooling System
Liquid cooled
Emissions
EURO5
Engine Lubrication
Wet sump
Exhaust
Closed-loop three-way catalytic converter
Fuel Consumption
3.50 litres/100 km (28.6 km/l or 67.21 mpg)
Fuel Induction
Electronic intake pipe fuel injection/digital engine management: BMS-ME with e-throttle grip
Fuel Reserve
4.00 litres / 1.06 US gallons
Ignition
BMS-E2 digital engine management
Lubrication
Wet-sump
Starter
Electric, 500 kW
Valve System
4
Clutch
Centrifugal dry clutch
Final Drive
Chain (final drive)
Gearbox
Automatic
Primary Drive
Chain drive in oil bath
Secondary Drive
Two step spur gearing
Transmission / Drive
Stepless CVT gearbox
Frame Type
Steel tube construction with aluminum die cast unit
Suspension - Front
35mm Telescopic forks
Suspension - Rear
Double Aluminum swingarm, double spring struts, adjustable preload
Rake
26.4°
Steering Head Angle
63.6°
Trail
81.2 mm / 3.2 in
Wheel Travel - Front
110 mm / 4.3 in
Wheel Travel - Rear
112 mm / 4.4 in
Lighting system
LED headlights
Brakes - Front
2x 265mm Rigid discs, 4 piston caliper
Brakes - Rear
Single 265mm disc, 1 piston floating caliper
ABS
BMW Motorrad ABS
Rims
Cast aluminum
Rims - Front
3.50 x 15
Rims - Rear
4.25 x 14
Tyres - Front
120/70 R15
Tyres - Rear
150/70 R14
Wheels
Aluminum cast wheels
Specifications are compiled from manufacturer documentation and cross-referenced
technical sources, and corrected on an ongoing basis.
Spot an error? Let us know.
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