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Honda Montesa Cota MRT 250 4RT/Repsol 2008
With a history reaching back nearly as far as motorcycling itself, the unique spectator sport of Observed Trials competition has grown to become an internationally popular motorsports event which places greater emphasis on rider skill and finely honed technique than on the usual attractions of top speed and maximum power. Held both indoors over often incredible constructions of daunting obstacles, and outdoors over some of the most difficult and treacherous terrain in the world—with steep, twisting, slippery slopes and seemingly insurmountable rocky outcroppings—trials competition is now highly regarded as an ultimate test of steady nerves and intense concentration.
Honda has also enjoyed a long history of involvement in Observed Trials competition, both under its own name and together with one of the biggest and best known names in the sport, Montesa. Working in close co-operation with Honda, Montesa-HRC (Honda Racing Corporation) riders have dominated the world’s top levels of trials competition in recent years, and Honda’s future in the sport remains bright.
Trials bikes have, for many years now, been powered almost exclusively by 2-stroke engines, which are certainly renowned for providing strong power in a compact and relatively simple configuration. Unfortunately, these attributes also come at the cost of highly polluting emissions, poor fuel economy and annoying engine noise. However, big changes are now on the horizon.
Long considered such a small and insignificant branch of motorsports as to be immune to the advances of ever more stringent international environmental controls, now even the relatively closed world of Observed Trials is being called upon to take greater responsibility for the protection of our shared environment, and because of this concern the run of polluting, inefficient 2-stroke engines now appears to be coming to an end. In fact, new regulations scheduled for introduction in the 2006 racing season will be calling for much stricter compliance with new emissions controls, which will surely spell the end of the 2-stroke engines currently used in World Trials competition.
ENGINE
Type Liquid-cooled 4-stroke 4-valve SOHC single
Displacement 249.1cm3
Bore Ă— Stroke 76.5 Ă— 54.2mm
Compression Ratio 10.5 : 1
Idling Speed 1,800min-1
Oil Capacity Engine: 0.6 litres; Transmission: 0.57 litres
FUEL SYSTEM
Carburation PGM-FI electronic fuel injection
Throttle Bore 28mm
Aircleaner Viscous, urethane foam filter
Fuel Tank Capacity 2 litres
ELECTRICAL SYSTEM
Ignition System Computer-controlled digital transistorised with electronic advance
Ignition Timing 27° BTDC (idle) ~ 45° BTDC (10,000min-1)
Sparkplug Type CR6EH-9 (NGK)
Starter Primary kick
ACG Output 160W
DRIVETRAIN
Clutch Wet, multiplate with coil springs
Clutch Operation Hydraulic
Transmission Type 5-speed
Primary Reduction 3.166 (57/18)
Gear Ratios 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 4.100 (41/10)
Final Drive #520 roller chain
FRAME
Type Diamond; Aluminium twin-spar
CHASSIS DIMENSIONS
Dimensions (LĂ—WĂ—H) 2,016 Ă— 830 Ă— 1,130mm
Wheelbase 1,321mm
Caster Angle 23°
Trail 63mm
Seat Height 650mm
Foot Peg Height 390mm
Ground Clearance 335mm
Dry Weight 73,8 kg
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 Aluminium rim/wire spoke
Rim Size Front 21 Ă— 1.60
Rear 18 Ă— MT2.15
Tyre Size Front 2.75–21
Rear 4.00–18
Tyre Pressure Front 39 – 44kPa
Rear 29 – 34kPa
BRAKES
Front 185 Ă— 3.5mm hydraulic disc with 4-piston calliper and sintered metal pads
Rear 150 Ă— 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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Centre Honda Genève, 3 Rue des Charmilles +41 22 339 70 00
ouvert du lundi - vendredi de 8h Ă 12h et de 13h45 Ă 18h au samedi de 9h Ă 12h
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