world trials series in the years ahead with a balance of performance and reliability that doesn t merely meet but categorically exceeds that of its longestablished 2-stroke competition bearing a close visual resemblance to the latest trials machines now used by the montesa-hrc team the new cota 4rt carries its revolutionary new 4stroke engine in an ultra lightweight and slim yet ruggedly constructed aluminium twin-spar frame fitted with world-class suspension and chassis components and styled for a dawning new age in the world of trials competition with all this and the close co-operation of montesa and honda ensuring that every part of its remarkable whole is imbued with the most advanced technologies and highest quality of construction the new cota 4rt now sets the stage for a new era of trials competition just as honda s now legendary rc211v has changed the course of history in the world s premier supersports racing arena the motogp circuit the new age of 4-stroke power has finally
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extensive efforts were made to lighten this new power unit wherever possible while maintaining competitively strong performance in the face of the lighter and technically more powerful 2-stroke competition engine cases were modified to achieve more compact proportions and the greater ground clearance required in trials competition while the base engine s balancer shaft was designed out of the cota 4rt s new performance equation in order to further minimise weight new sohc head design the engine s 4-valve head configuration was one of the first things targeted for modification realising a more compact overall shape while still maintaining the same highly efficient combustion chamber design of its predecessor was a key design requirement so valve actuation is performed by a single overhead cam operating conventional rocker arms instead of the unicam system utilised by the higher-revving crf250r while cylinder proportions and their corresponding performance characteristics were refined wi
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integrates the throttle body and all the digital electronic control of its ecu into a single lightweight unit installed in the position conventionally taken up by a carburettor the injector itself is an 8-hole unit mounted directly to the engine head the system s built-in sensors monitor such variables as intake port air pressure and air temperature while monitoring engine speed at the acg s pulsar making instantaneous calculations to assure top performance and minutely responsive control under all operating conditions even at high altitudes that can often prove difficult to tune for with conventionally carburated engines needless to say the black art of jetting selection is now a thing of the past battery-free starting the new cota 4rt also features a high-accuracy digital ignition system that maintains optimal timing and top performance through the engine s entire rev range from first startup to high-revving power leaps over giant obstacles however one of the most significant develop
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torque compared to a 2-stroke engine of the same approximate displacement while maximising its stronger midrange power delivery to achieve the hightraction surge of acceleration and smooth predictable control that trials riders need most and can best use a difficult blend of performance to achieve but remarkably well accomplished in the new cota 4rt as any trials rider knows all to well peak power figures are essentially irrelevant to winning performance in their unique form of competition what counts is strong yet smoothly predictable low-to-midrange power output that can carry a machine and its rider over monstrous obstacles and often slippery surfaces with equal ease finesse not brute force is the ultimate key to victory the engine s slightly higher rpm operation permits the transmission to be geared with lower ratios than normally used in this class delivering not only a comparable range of performance but also astoundingly competitive performance as evidenced by rtl250f s impressi
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any rider however will surely be its remarkable smoothness and the confident grunt of tractable midrange performance that comes on strong and linearly with each twist of its throttle chassis the new cota 4rt carries its new 4-stroke engine in a slim and lightweight allaluminium twin-spar frame which grips the engine in a diamond configuration for an optimised balance of rigidity and riding performance this new composite section frame like the cota 4rt s entire chassis has also been specially designed for lighter weight and sleeker proportions that enhance rider manoeuvrability and control although the cota 4rt s new liquid-cooled 4-stroke engine including its revolutionary new fuel injection system is somewhat heavier than the other 2stroke engines in its class this weight difference has been more than made up for in an extensively detailed weight loss campaign carried out in the rest of the cota 4rt s sleek and beautiful form from narrower and thinner-walled frame sections to smaller
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fully adjustable showa 39mm cartridge-type front fork provides excellent feedback and control smoothly soaking up the shocks of everything from rocky climbs to high drops at the rear the cota 4rt s progressive pro-link rear suspension system delivers a precisely adjustable balance of spring and damping to better help a rider leap up vertical tests and tenaciously maintain traction up their slippery faces settings have of course been specially tuned to fit the cota 4rt s new overall design making possible a precisely measured fit for riders of varying weights and needs lightweight wheels tubeless rear tyre in the cota 4rt s quest for lighter weight even its wheels received detailed modifications in the form of a significantly lighter new 32-spoke configuration replacing the 36-spoke format used on the latest montesa cota 315r on which the new cota 4rt is roughly based also like the cota 315r the new cota 4rt uses an innovative rear wheel design that features centre-adjustable spokes mou
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and license plate bracket that allows it to be ridden legally on public roads these components have also been designed for easy detachment by customers who wish to pursue more competitive off-road-only applications optional equipment performance tuning kit for competition riders who want the freedom to electronically tune the cota 4rt s ignition and fuel injection mapping systems for better performance honda racing corporation hrc will be supplying a specially designed fuel injection kit as optional race equipment the kit will be distributed by montesa honda s.a and contains new throttle body and ecu module interface cd-rom harness this kit will allow customers and mechanics to reprogramme the original ignition and fuel injection mapping by way of a laptop computer in addition hrc has also developed a fuel injection system self-diagnostic programme which will allow customers and mechanics to follow a troubleshooting procedure using an easy to understand warning lamp code this programme
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changed and re-introduced as the first montesa cota in history the legendary montesa cota 247 from that time forward to the present day the montesa factory never stopped manufacturing multiple versions of the cota model which gradually won the company international prestige as a great brand while accumulating an enormous number of victories in virtually every kind of national or international competition however the company s most import victory arrived in 1980 when ulf karlson won the trial world championship riding a prototype of the future and equally successful montesa cota 349 which one year later brought montesa a new world championship and the manufacturers title as well 1983 was also a very important year for montesa following years of struggle in a weakened economic climate the company forged an agreement of mutual co-operation with honda motor co which would lead to the creation of a new organisation montesa honda s.a the consolidation of this agreement was achieved in 1986
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today montesa honda is a modern factory with a sparkling new production plant established in 2000 at santa perpetua de la mogoda barcelona where at present a total of 6 models are produced among these the majestic varadero 1000 the only abs-equipped motorcycle manufactured in spain this same plant will be producing the new montesa cota 4rt and the honda hrc rtl250 which is being made exclusively for the japanese market as well as future world champions to come important data current repsol montesa hrc team riders dougie lampkin takahisa fujinami marc freixa laia sanz track record 8 outdoor world championships 80 81 96 00 01 02 03 `04 5 indoor world championships 95 96 99 00 01 1 women world championship 04 victory in the 2002 scottish six days trial 2005 outdoor world titles not yet decided during the edition of this document,
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specifications engine type displacement bore × stroke compression ratio idling speed oil capacity fuel system carburation throttle bore aircleaner fuel tank capacity electrical system ignition system ignition timing sparkplug type starter acg output drivetrain clutch clutch operation transmission type primary reduction gear ratios montesa cota 4rt ed-type liquid-cooled 4-stroke 4-valve sohc single 249.1cm3 76.5 × 54.2mm 10.5 1 1,800min -1 engine 0.6 litres transmission 0.57 litres pgm-fi electronic fuel injection 28mm viscous urethane foam filter 2 litres computer-controlled digital transistorised with electronic advance 27° btdc idle 45° btdc 10,000min-1 cr6eh-9 ngk primary kick 160w wet multiplate with coil springs hydraulic 5-speed 3.166 57/18 1 2.800 42/15 2 2.384 31/13 3 2.000 30/15 4 1.272 28/22 5 0.814 22/27 final reduction final drive 4.100 41/10 #520 roller chain
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frame type chassis dimensions dimensions wheelbase caster angle trail seat height foot peg height ground clearance dry weight l×w×h 2,016 × 830 × 1,130mm 1,321mm 23° 63mm 650mm 390mm 335mm 73,8 kg diamond aluminium twin-spar suspension front 39mm showa cartridge-type telescopic fork with 22-step adjustable compression and 20-step rebound damping 175mm axle travel rear pro-link with showa single damper stepless compression and 12-step rebound damping adjustment 170mm axle travel wheels type rim size tyre size tyre pressure aluminium rim/wire spoke front 21 × 1.60 rear 18 × mt2.15 front 2.7521 rear 4.0018 front 39 44kpa rear 29 34kpa brakes front 185 × 3.5mm hydraulic disc with 4-piston calliper and sintered metal pads rear 150 × 2.5mm hydraulic disc with dual-piston calliper and sintered metal pads all specifications are provisional and subject to change without notice.
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