Carburettor / Electric-Start ModeL
Fuelling: Keihin 38mm
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’ crank-seals, forged piston (250cc), friction reduction coated piston (300cc), 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 (new main shaft), MX / EN differing ratio gearboxes, hydraulic clutch actuation, V-Force reed blocks, Keihin Carburetors (MX/SMX/FT), Fuel Injection with twin injectors and separate electronic control oil distribution (EN models), Electric start, Balancer shaft, HGS Exhaust systems (with plated expansion chambers on EN / Road models), TMEES electronic exhaust valve control, Kokusan digital variable advance ignition with twin map selection, gear position sensitive variable ignition timing.
The large capacity TM Racing 250cc and 300cc 2-stroke engines are synonymous with strength and durability, with each capacity engine having its own unique qualities in the terms of performance and power delivery characteristics. In 2019 the engines have had a total re-design and feature a multitude of new and exciting additions to increase performance and ease of use for the rider. Whilst retaining many well proven internal components, from the exterior, the engines have a whole new look and share little in cast components with the outgoing engine. The complete re-design has been produced to accommodate numerous changes, changes that include electric start on all models, alongside a fuel injection option on EN models with a digitally controlled oil distribution system, whilst carburettors remain on the MX / SMX / FT models. A revised gearbox assembly also features, with friction reduction coated and treated parts to ensure smooth and precise shifting. We also have the addition of a balancer shaft to reduce engine vibration giving smoother performance, better ‘feel’ and a reduction in rider fatigue. The gear position sensitive ignition works alongside the TMEES exhaust valve control system, which also features a new operational control system, that will see the servo mounted to a new cylinder and working directly to a new pulley system. Revised electronic control programming, alongside the handlebar mounted twin ignition map switch, allows the power delivery for each of the 250cc and 300cc engines to not only be tailored by the rider on track, but the electronic systems also make alterations to the mapping depending on gear selection, valve position, rpm (and communication to the fuel injection system where applicable), ensuring the best power delivery and traction at all times. A system that is proving to be great for the hole-shot and those slippery rock sections alike, depending on machine and discipline of course, thus allowing the engine and control systems to give the rider the required power and torque at the required time, giving the best in traction in all conditions. Constructed from some of the best materials for maintaining performance and reliability these already class leading engines that produce incredible, yet usable, controlled power and torque combined with quality ancillary components, have taken themselves to a new level. Power delivery, rider comfort and ultimate outright performance is optimally tailored in each discipline in all conditions in a way never seen before in off-road 2-stroke engines. For 2020 the EN / SMR models will also feature new larger capacity radiators and an improved cooling circuit alongside a revised oil distribution system for the lubrication of the engine.
The high-end specification of all TM Racing machines is well versed and this model year is no exception, once again the specification list for a production machine is vast and features numerous high-quality components, many revised 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 it’s 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 componentry. 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 handle bars are secured, via the optional ‘damped’ bar mounting system, by billet machined bar clamps, with the top bar clamps featuring machined TM logo’s 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.
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