Motocross Bikes
2021TM Racing MX 450 Fi 4T
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The 2021 TM Racing MX 450 Fi 4T is a hand-built Italian motocross racer with fuel injection. Its liquid-cooled 449cc four-stroke single makes 56 hp through a six-speed gearbox. A 1,000 mm seat, 107.5 kg dry weight and a 7.5-litre tank suit top-level competition.
- Capacity
- 449.0 ccm
- Engine
- Single, four-stroke
- Gearbox
- 6-speed
- Dry weight
- 107.5 kg
- Seat height
- 1000 mm
- Power
- 56.0 HP (41.2 kW)
How it rides
Editorial estimate from the spec sheet - not lab tested- Best for
- Built for off-road and motocross-style riding on tracks and closed terrain rather than public roads.
- Built for
- A motocross bike from TM racing with a 449cc engine; its character is versatile and engaging, with 56 hp on tap.
- Not ideal for
- Not road-legal in most markets and not for commuting or touring.
Scores are derived from the spec sheet using the same model across every bike, so they compare like for like.
Will it fit you?
Worked out in your browser - nothing is sent to usEngine
- Capacity
- 449.0 ccm
- Power
- 56.0 HP (41.2 kW)
- Engine type
- Single, four-stroke
- Power/weight ratio
- 0.5209 HP/kg (dry)
- Bore x stroke
- 95.0 x 63.4 mm
- Cooling system
- Liquid
- Fuel system
- Injection
- Starting
- Electric & kick
- Ignition
- Kokusan, ECU
- Valves per cylinder
- 4
- Lubrication system
- Dry sump with 2 pumps
Transmission
- Gearbox
- 6-speed
- Transmission type
- Manual
- Final drive
- Chain
- Clutch
- Multiuple-disk in oil-bath with hydaulic control
Dimensions & weight
- Seat height
- 1000 mm
- Dry weight
- 107.5 kg
- Fuel capacity
- 7.50 litres
- Ground clearance
- 360 mm
Chassis & suspension
- Frame
- Alluminium perimetral
- Front suspension
- USD 48mm Kayana
- Rear suspension
- TM Racing monoshock
- Front wheel travel
- 310 mm
- Rear wheel travel
- 300 mm
- Rake (fork angle)
- 27.0°
Brakes & wheels
- Front brakes
- Single disc. Wave disk with Nissin pump and caliper
- Front brakes diameter
- 270 mm
- Rear brakes
- Single disc. Wave disk with Nissin pump and caliper
- Front tyre
- 80/100-21
- Rear tyre
- 110/90-19
Other
- Color options
- Blue/white
- Comments
- Italian brand.
Specs last verified against published sources: .
Compiled from manufacturer documentation and user contributions, corrected on an ongoing basis. Spotted something wrong? Tell us.
What changed, year to year
Differences highlighted| Specification | 2020 | 2021 | 2022 | 2023 | 2024 |
|---|---|---|---|---|---|
| Capacity | 449 cc | 449 cc | 449 cc | 449 cc | 449 cc |
| Dry weight | 108 kg | 108 kg | 108 kg | 108 kg | 108 kg |
| Seat height | 1000 mm | 1000 mm | 1000 mm | 1000 mm | 1000 mm |
| Fuel capacity | 7.5 L | 7.5 L | 7.5 L | 7.5 L | 7.5 L |
Illustrative - generated automatically by diffing the year records already on file, not a manufacturer-published changelog.
Rider Reviews
Common questions
What is the engine size of the TM Racing MX 450 Fi 4T?
The 2021 TM Racing MX 450 Fi 4T has a Capacity of 449.0 ccm (27.40 cubic inches).
What engine power does the TM Racing MX 450 Fi 4T have?
The 2021 TM Racing MX 450 Fi 4T has a Power of 56.0 HP (41.2 kW).
How many gears does the TM Racing MX 450 Fi 4T have?
The 2021 TM Racing MX 450 Fi 4T has a Gearbox of 6-speed.
How much does the TM Racing MX 450 Fi 4T weigh?
The 2021 TM Racing MX 450 Fi 4T has a Dry weight of 107.5 kg (237.0 pounds).
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