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EN 300Fi ES

Twin Exhaust

- Enduro GP World Championship Winning Pedigree -

Homologation Exhaust Pictured.

TM Racing EN 300Fi ES - Twin Exhaust: Information

SPECIFICATION: ' New Engine'


Bore and Stroke:

Displacement: 300cc

Compression ratio: N.A.

Horse power: N.A.

Timing system: DOHC with finger follower and 4 Titanium Valves

Lubrification: Dry sump with double rotor pump

Fuelling: Electronic Fuel Injection 

Fuel: Super-unleaded

Ignition: Kokusan Electronic

Clutch: Multiple-disk in oil-bath with hydaulic control

Gear: 6 gears

Cooler System: Coolant liquid with pump

Starting: Electric + Kick start 

Frame: Perimetral aluminium section

Front fork: Kayaba USD

Rear shock: TM Racing

Front tyre: 90/90X21

Rear tyre: 100/90X19

Front brake: Braking wave disk 270 mm, with Nissin pump and Brembo caliper

Rear brake: Braking wave disk 245 mm. With Nissin pump and caliper

Tank: Plastic 8,2 litres


250Fi ‘Twin’ / 300Fi ‘Twin’ / 450Fi / 450Fi ‘Twin’ / 530Fi:
4-Stroke Engines – Single Cylinder, Water Cooled, 4-Valve, Twin Cam, Fuel Injected.

Hand finished crankcases, lightweight and strong die-cast clutch casing, clutch inspection, water pump and ignition covers, cast water pump rotor, billet machined crankshafts (running on roller bearings with ‘hi-tech’ crankseal – 250Fi/300Fi), billet connecting rods, box-bridged pistons with DLC coated gudgeon pics, hand finished cylinder heads, titanium valves matched to copper beryllium valve seats, chain driven overhead twin camshafts actuating ‘finger followers’ on 250Fi/300Fi and ‘valve buckets’ on 450Fi/530Fi, 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 gear-shaft parts, 5 speed MX / 6 speed EN 450Fi/530Fi – 6 speed 250Fi/300Fi (differing ratio) gearboxes, hydraulic clutch actuation, Battery-less ‘down-draught’ Electronic Fuel Injection, Kokusan digital variable advance ignition with twin map selection working with the fuel injection systems, gear position sensitive variable ignition timing, HGS ‘bomb’ type Exhaust systems. Electric start on EN and Road models, standard fitment on UK MX models and optional on SMX/FT 4-Stroke models models.

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 spread to accommodate not only the off-road sector, but now feature in other motorsports, road racing and Karting primarily. TM Racing’s 4-stroke motorcycle range has seen great success over the past seasons, with the SMX 450Fi machine now having taken multiple Supermotard World Championship titles, it currently leads the way once again and has become regarded as the bike to be riding in Supermotard to get the desired results. A purpose designed Supermotard bike that can be bought as a package, ready to thrive in this discipline where others are generally adapted machines created from other models. 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. The latest MX 250Fi / 300Fi 4S ‘Twin’ machines have been turning heads and impressing riders globally with its sheer performance and handling, a superbly engineered racing machine that is outperforming its predecessor in all aspects and is set to achieve great results. This latest evolution of 250Fi / 300Fi engine features in the EN model also, albeit with revised configurations specific to the Enduro discipline.

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 2021, with some larger changes to some engine variants in the range. All 250Fi / 300Fi models will now feature the ‘twin port’ cylinder head configuration, the pure performance of this engine has been proven in some of the world toughest environments with huge success over the past seasons and will now be the ‘standard’ engine configuration of the smaller capacity 4-stroke line-up. The 250Fi/300Fi ES-4S engines will receive a revised ECU programming, designed to work alongside the recently revised intake manifold, maximising the responsiveness and outright engine performance of these already incredible engines. Likewise, these changes will also apply to the new Enduro model variants of these engines that, like all TM 4-stroke engines, will have many internal differences to the camshaft, piston, crankshaft, con-rod and settings in the electronics to tailor the performance to the Enduro market. The legendary 450Fi engine, that has dominated in its Supermotard guise for a decade, receives only minor updates to some ancillary components and settings for the MX / Road variants. The largest change within the range for 2021 is that the 450Fi / 530Fi Enduro variants will now feature a new 6 speed gearbox assembly that will replace the previous 5 speed gearbox, all MX and EN variants will also receive a new fuel injector with new ECU programming, SM variants also receive a new piston design. TM Racing’s legendary ‘SMX’ variant now comes with two main engine options, the existing 450cc engine (Single Pipe Cylinder Head) and the ‘Special Kit’ option, the latter being the ‘Twin Pipe’ cylinder head engine used by the TM Racing Factory team with great success. All SMX 450Fi engine variants receive new improved porting. The ‘Twin’ engine features a twin exhaust system exiting the head itself as two separate exhausts like its smaller capacity brethren, the 250Fi and 300Fi, alongside a twin injector throttle body working in unison with revised ECU and operating programs, these changes give greater performance throughout the rpm range. The best just got better.

CHASSIS: The high-end specification of all TM Racing machines is well-versed, this model year is no exception. Once again the specification list for a production machine is vast and features numerous high-quality components, with some subtle revisions for the new range. All full-size models will once again be constructed using an aluminium chassis and sub-frame, 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 some revisions in geometry / triple clamp angles that are specifically tailored to each model, allowing the best in handling characteristics for each model variant in the range. On all models, the now standard fitment KYB 48mm twin chamber forks (50mm DLC coated Marzocchi on SMX models) will continue to adopt the latest generation ‘coatings’, these forks are designed to give an 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, remains and stills adopts the latest ‘sealing’ system to reduce the frictional losses and increase shock performance, combined with the latest swing-arm, linkage components and larger rear spindle diameter to limit flex, always 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 body panels will remain the same, albeit with a new fork guard and LED headlight on road models, with the option of white front fenders, fork guards and front number plates / headlight available as ‘spare parts’ purchases. 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 however feature a new decal scheme 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, on the top of the 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 recently adopted ‘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 of the TM racing model range has also received some new components in the form of some new options for the SMX 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 the use of 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. New triple clamps angles feature on the new 250/300 2-Stroke machines.

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 cylinder, 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 Racings ‘cush-drive’ clutch baskets, which on the 250cc/300c and Fi variants 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 can be found on all 4-stroke Fi Enduro models and Road models, is standard UK fitment for Fi MX models and is also available as an option Fi SMX variants.  Electric start will also come as standard fitment on 2-Stroke Fuel Injection 250cc / 300cc Enduro machines and the carbureted 250cc / 300cc MX machines.  

ENDURO / ROAD EQUIPMENT: All Enduro and ‘Road’ designated variants of the TM racing model range come with a full, self-generating lighting system (which can operate also from the battery system on Electric Start models) powered by the crankshaft mounted electrical generator. This system includes a complete side, dipped and main beam headlight assembly, taillight and rear brake light – operated by both front and rear brake actuation cylinders – with rear number plate illumination, a turn signal system consisting of 4 flasher units and a horn. All these functions are controlled via a handlebar mounted multi-switch that also includes an ‘engine stop’ button, on Fi ES models a ‘choke’ lever also features on the multi-switch. Working alongside the lighting part of the system is an illuminated digital speedometer with ‘trip’ functionality, this speedometer unit registers the vehicles given speed via a sensor located on the rear wheel of the motorcycle.

2021 Price: £9,615.00

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