TM UK: TM Racing 'Moto' Official Importer

4T 450Fi SMK Pictured

4T 250Fi SMK

Specifications: 4T 250Fi smk

  • Bore and Stroke:  77mm x 53.6mm
  • Displacement:  249.6cm3
  • Intake : Throttle Body
  • Fuelling: Electronic Fuel Injection – Emoticon ECU
  • Ignition: Kokusan – Emoticon ECU
  • Clutch: Multiple-disk in oil bath with hydraulic control
  • Gear: 6 gear
  • Cooling System: Coolant liquid with pump
  • Frame: Aluminium Deltabox Beam Extrusion / Forged & Micro-cast Parts
  • Front fork: KYB 48mm
  • Rear shock: TM Racing
  • Front tyre: 16.5″
  • Rear tyre: 17″
  • Front brake: 305mm Disc – Brembo Pump & Caliper
  • Rear brake: 245mm Disc – Nissin Pump & Caliper
  • Tank:  7.5 Litre
  • Seat Height: 94cm
  • Weight: 106kg (‘wet’ – without fuel)

SMK Options:

  • 005: Bar Dampers for CNC Clamp – All Models
  • 007: Ohlins TTX ‘Flow’ Shock – SMR / SMK
  • 022: CNC Clutch Cover – 4T Models
  • 023.2: CNC Ignition Cover – 2T 125Fi / 144Fi
  • 023.4: CNC Ignition Cover – 4T 250Fi / 300Fi
  • 025: Brembo Racing Front Brake System – SMK
  • 032: d.205mm Rr Disc + CNC Carrier – SMK
  • 037: 12 Litre Fuel Tank – 2T Models
  • 038: Ohlins TTX Cartridges – KYB: SMX / SMK
  • 039: sTs Alpina System: 5.5” Rr + 16.5” Ft – SMX / SMK
  • 040: sTs Alpina System: 5.5” Rr + 16” Ft – SMX / SMK
  • 045: sTs Alpina System: 5.0” Rr + 16.5” Ft – SMX / SMK
  • 046: sTs Alpina System: 5.0” Rr + 16” Ft – SMX / SMK
  • 041: Brembo Caliper M4.34 + Fork Foot c-108 – SMX / SMK
  • 042: 6 Spd Box: 2T 250/300 – MX / SMX
  • 042: 6 Spd Box: EN 450Fi (Not Homologated)
  • 043: STM Slipper Clutch + CNC Cover 022 – SMX / SMK
  • 044: Elec’ Radiator Fan – EN / SMR / SMX / SMK 2T & 4T
  • 047: Elec’ Gearbox Activation – 4T SMR / SMX
  • 048: 2.15 Rear Wheel – 125/144 & 250Fi/300Fi
  • 049: Special Fork – SMK
  • 050: Special Shock Absorber – SMK
  • 95160.1: ‘Welcome Kit’: Bike Stand, Mat, Grip Covers.
  • 95375.1:  Thermal Tech: Tyre Warmers


All Options Must Be Placed At Time Of Order With Your Dealer.  The ‘Replaced’ Parts Are Not Supplied As ‘Spare’ Parts’.

Dominating For A Decade

Multiple Domestic, European & World Champion Titles


4T – 250Fi ‘Twin’ / 300Fi ‘Twin’ / 450Fi / 530Fi Engines:

Hand finished crankcases. Lightweight and strong die-cast clutch casing, clutch inspection, water pump and ignition covers. Aluminium water pump rotor. Billet machined crankshafts (running on roller bearings with ‘hi-tech’ crankseals – 250Fi/300Fi). Billet connecting rods. Box-bridged pistons with DLC coated gudgeon pins. Hand finished cylinder heads. Titanium valves matched to copper beryllium valve seats. Chain driven overhead twin camshafts actuating ‘finger followers’. Twin rotor oil pump (dry sump type arrangement). High performance – long lasting clutches. ‘Cush-drive’ clutch baskets. Friction reduction hard coated clutch baskets. Friction reduction hard coated gearbox selector fork tips. Hardened / Treated gear-shaft parts. 5 speed MX / SMK with 6 speed option / 6 speed EN 450Fi/530Fi / 6 speed 250Fi/300Fi (differing ratio) gearboxes. Hydraulic clutch actuation. Emoticon controlled Fuel Injection systems. Kokusan digital variable advance ignition with twin map selection working with the Fi systems. Gear position sensitive variable ignition timing. HGS ‘bomb’ type Exhaust systems. Electric start.

The TM Racing range of 4-stroke engines has become legendary for exceptional power delivery and outright performance and durability. The ability of these engines to perform has become renowned worldwide and for a ‘production’ engine the internal components and materials used are unmatched, many of these components and materials being of a level of quality that would only usually adorn the best of the ‘factory’ engine machinery. With an ever-growing list of results globally in many disciplines, the 4-stroke range of TM Racing engines has grown to not only accommodate the off-road sector, but also now feature in road racing and even Karting. The smaller capacity 250Fi / 300Fi engines have been dominating in the Enduro world for several years, taking multiple world titles, European and domestic titles around the globe. Likewise, the 250Fi / 300Fi MX and SMX variants are adding to the trophy cabinet tally. TM Racing’s larger capacity 4-stroke motorcycle range has seen great success over the past seasons, with the SMX (SMK) 450Fi machine now having taken multiple Supermotard World Championship and domestic championship titles. This year has been no different and once again the latest ‘SMK’ 450Fi version is leading the way, taking yet more World and European Championship titles this year. Held in high regard, the SMK is the bike to be riding in Supermotard to get the desired results, this machine has been designed and built specifically without compromise. A bike that can be bought as a package, ready to thrive in this discipline, where others are generally adapted machines created from other MX base models, the SMK 450 is proving unstoppable as did the SMX version before it. The 450Fi Enduro model was also recently adopted and developed to form the TM Racing Rallye bike, the 450 DKR / Rallye, a machine that has taken world championship victories in its class, a great testament to performance and durability in the harshest conditions. The 250Fi and 300Fi variants are also currently setting the world stage alight and have taken many World titles in the hugely competitive World Enduro Championship. These latest TM Racing 4-stroke machines have been turning heads and impressing riders globally with their sheer performance and handling, a superbly engineered racing machine that are outperforming their predecessor in all aspects and achieving great results.

The 4-stroke range will retain the current ‘reverse’ chassis configuration with fuel tank under the seat and the air intake above the engine. This layout has seen a huge transformation in the handling characteristics of all the 4-stroke models since it was introduced and has been gradually improved upon year on year. Centralised mass, better outright balance and revisions to the geometry and suspension settings have allowed TM Racing to create and incredible range of 4-stroke machinery all with superb ability and agility. An incredible range of engines matched to an incredible range of chassis, each tailored to a ‘base’ engine, have given TM Racing the ultimate range in 4-stroke machinery, with each model proving itself to be class leading on the world stage in it’s given discipline. We have some small but significant changes to the engines for the new model year, alongside a new engine for the MX 450Fi model, all model variant engines differ internally on a large scale also, differences to the camshaft, piston, valves, crankshaft, con-rod, gearboxes and more, not to mention settings in the electronics and fuelling systems to tailor the performance of each engine perfectly. Each of these changes is tailored to every model and designed to work alongside the revised throttle bodies and Fi systems, maximising the responsiveness and outright engine performance of these already incredible engines for each given discipline. The legendary 450Fi engine, that has dominated in its Supermotard guise for over a decade, seen huge changes in 2022 with the release of the ‘twin’ pipe engine ‘SMK’ model – akin to its smaller capacity brethren, that featured a revised cylinder head with two exhaust systems and a finger follower valve train. This engine design will now be defined as the TM Racing 450Fi engine of choice in terms of performance and thusly we will now see a revised variant in the MX 450Fi machine. All 4-strokes models will receive some technical changes for the new model year, all designed to work harmoniously to give greater performance throughout. The best just got better.


The high-end specification of all TM Racing machines is well-versed and this model year is no exception. The specification list for a ‘production machine’ is vast and features numerous high-quality components throughout. For 2024 we have several small changes and revisions to further enhance the ‘new for 2022’ chassis that was already designed to improve handling, weight balance, overall machine weight (reduced), rider ergonomics and the visual look. All variants chassis’ and sub-frames will once again be constructed using aluminium, with each engine ‘capacity’ / variant having a chassis unique to that engine displacement. This ‘tailoring’ of the chassis to engine allows TM Racing to design and build each machine for minimal weight, compactness, and better handling characteristics with mass centralisation specific to each model whether 2-stroke or 4-stroke. All chassis are constructed using the latest design elements that reduce overall chassis weight whilst maintaining maximum strength, matched to new revisions in chassis geometry / triple clamp angles that are specifically tailored to each model once again, allowing the best in handling characteristics for each model in the range. On all models, the now standard fitment KYB 48mm twin chamber fork, will continue to adopt the latest generation of internal friction reduction ‘coatings’ with some revised settings from 2023. These latest generation forks are designed to give improved response for faster changes to the terrain, all still controlled by the more favourable spring and oil set-up which is still proving to give greater reliability and more consistent performance.  The TM Racing shock absorber, made in house by the TM racing technicians, has seen some large internal changes over the last 2 years and will still adopt this latest ‘seal’ system designed to reduce friction and increase shock performance. Combined with the latest swing-arms, linkage components and spindle diameters to limit and ‘control’ flex, the shock allows for a more progressive feel, giving improved track stability and maximising traction. The chassis and suspension components work together to achieve incredible handling characteristics on a multitude of surfaces, allowing for greater stability in all conditions, increasing traction and inspiring greater confidence to reduce lap-times. The aesthetic look of the machines will remain as per 2023, where the latest chassis generation is not only ‘form’ but ‘function’, reducing the width of the bike reduced by 3cm to create a slimmer machine with better rider ergonomics and more freedom of movement. The current appearance of the latest generation model range is still one of the most striking to date, a mix of angles and curves that blend seamlessly into each other from front to rear. Beautiful, yet aggressive in its shaping, the body panels will feature a new decal scheme for 2024 incorporating some brighter colour accents giving a more striking visual appearance.

‘FRESH AIR SYSTEM’: All TM Racing adult 2-Stroke models feature the ‘Fresh Air’ intake system which allows the engine air filtration system to breathe cleaner air, this system reduces particulate contamination of the air filter maximising power for longer duration. Air is channeled from the intake vents –  via the radiator panels and fuel tank –  to the airbox which houses a large volume air filter. The ‘Fresh-Air’ system also brings another added advantage in the form of a lower centre of gravity, with the fuel tank now positioned slightly further into the chassis around the engines cylinder, this ‘weight’ shift, combined with the latest frame geometry and suspension, all work harmoniously to maximise the handling characteristics of each machine. The 4-Stroke machines also continue with ‘reverse’ layout, which sees the fuel tank moved under the seat area whilst the engine intake and filtration system is now positioned above the engine. This allows the 4-Stroke engine to breathe cleaner air with a much more direct air feed into the Fi throttle body, filter contamination is decreased whilst engine performance and response is maximised. This chassis layout witnessed a huge transformation to the complete range of 4-stroke model machines, with the centre of gravity lowered further into the chassis, especially when noting that each capacity model has its own main chassis unique to a specific engine base. TM Racing have created a line of incredibly nimble and agile machines, better handling characteristics, turning, stability and weight losses were seen throughout the current chassis guise as well as gains in engine performance.

WHEELS: The CNC machined billet aluminium hubs, laced to anodized Excel rims, feature the latest spoke arrangement with a ‘tapering’ design profile in a stronger material, a material treated to increase corrosion resistance, larger spoke nipples feature on the front wheel also for added strength. The wheel configuration allows for the best in strength and durability of the wheel components whilst reducing the un-sprung weight by a small margin. The CNC machined hubs, featuring external dust seals encircling CNC machined wheels spacers to further protect the wheel bearings, are mounted to the suspension components via large diameter hollow spindles. The larger diameter spindles, machined through their centres to lower weight, allow for a more rigid fixing off the wheel reducing the flex and allowing the suspension to work more effectively.

BRAKING SYSTEMS: The braking systems for the TM racing model range has also received some new components in the form of some new options for the SMK range and new Brembo front brake pumps for some adult models. The entire model range continues to feature high quality oversize wave discs working with TM Racing’s ‘mix’ of components. The master cylinders are connected to the brake calipers with lined and braided high quality racing brake lines that are designed to minimise expansion and ensure maximum braking effort is always transmitted to the calipers. This tried and tested collaboration of parts is regarded as one of the best braking systems in many tests and by racers alike. These braking systems keeps performing in the harshest conditions giving great efficiency and inspiring confidence always. The rear brake system is actuated by a twin bearing pivot-mounted, billet machined aluminium foot lever with a replaceable tip.

TRIPLE CLAMPS: The triple clamps fitted to TM Racing motorcycles competition range are CNC machined from block aluminium and each clamp is a work of art. The clamps intricate machining, most of which can only be seen from the underside, gives a structure designed to be supremely strong whilst keeping weight to minimum. The triple clamps also come with an optional ‘damped’ bar mounting system that through a tapering rubber cone arrangement, allow vibrations that can be transmitted through to the handlebar area to be reduced, whilst also allowing some ‘give’ to the bars in the event of a fall reducing the chances of more severe damage occurring to the handlebars and the components adorning them. The handlebars are secured, via the optional ‘damped’ bar mounting system, by billet machined bar clamps, with the top bar clamps featuring a machined TM Racing logo on their upper face.

CLUTCH ACTUATION: All TM Racing machines come fitted with a Hydraulic actuated clutch as standard, the master cylinder, made by Brembo, transmits fluid via a lined and braided hydraulic line to TM Racing’s own ‘slave’ cylinders. With separate slave cylinders for the 85/125/144 engines, the 250/300 engine, the 250Fi/300Fi engines and the 450Fi and 530Fi engines, each unit designed to fit and perform for each model giving a balanced clutch feel between all engine size variants, with both single and dual seal pistons in the slave cylinders depending on model application. The Brembo master cylinders, working with the braided hose that limits hose expansion under extreme load, gives great feel and precise clutch control with great durability when combined with TM Racing’s ‘cush-drive’ (hard coated) clutch baskets, which on all variants 250cc and over, are coated with a hard wearing, friction reduction coating. All clutches are multiple disc ‘wet’ units with multi sprung pressure plates.

ELECTRIC STARTING: The ES abbreviation in any motorcycles descriptive from the TM racing range denotes that the machine has ‘Electric Start’. The TM Racing Electric start system is powered by a new, lightweight, Lithium-Ion battery that is recharged during engine running by the electrical system. Electric start is now standard fitment on all models and engine capacities over 144cc.

Price 2024:

4T 250Fi SMK: £12,395.00

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