CAUSEWAY YAMAHA

  

        

Step up to the next level

Like nothing you’ve ridden before, Supertrail is an exciting new dimension in dual purpose design that tantalisingly blends cutting edge technology with visual beauty and an outstanding riding experience.

The heart of the concept is a new 4-valve engine with the very first fuel-injected Yamaha on/off road engine, characterised by exceptionally precise throttle response and power delivery that crescendos with a wailing 10,000rpm top end.www

Your very first ride will also reveal the taut, responsive handling, and make it clear that this is the new pinnacle in dual purpose performance with the depth of appeal and reliability to satisfy a much wider range of riders.

A physical manifestation of pure riding passion.

♦   Brand new liquid-cooled 4-valve engine with fuel injection. Adopting the same short stroke dimensions as the YZ250F and WR250F, the Supertrail engine features a compact combustion chamber and a 11.8:1 compression ratio that produces maximum power output at an astonishing 10,000rpm.

♦   Large diameter titanium intake valves and high lift cams with excellent follow and lift characteristics allow high rpm levels. Downdraft-type straight air intake layout combined with fuel injection and pent roof combustion chamber result in a quick ignition flame spread. Which in turns means strong power and instant throttle response.

♦   Fuel injection system also promotes excellent fuel economy and environmental friendliness. Sensors monitor crank, intake air pressure and throttle position and feed info to a super-compact ECU unit to calculate optimum fuel volume and injection timing.

♦   Plated cylinder features a lightweight forged piston with a piston cooler. By eliminating materials with different heat-transmission rates from the liner, cooling efficiency is improved and oil consumption is also reduced.

♦   Weight saving wet sump engine lubrication system has fewer auxiliary parts than dry sump. And the new engine’s three axis layout (the relative positions of the crank shaft, the main shaft and the drive shaft) further concentrates mass for improved handling.

♦   Smooth operating clutch combines with a six speed gearbox to provide slick shifting and a gear for every occasion.

♦   Supersport type large capacity ACM (Alternative Current Magnet) alternator is adopted to provide abundant and reliable electricity supply for lighting, spark and fuel injection system. Spark is further aided by direct ignition coil.

♦   A three stage expansion chamber type muffler layout has been designed to bring the muffler closer to the machine’s centre of gravity for lighter handling. Air induction system and honeycomb type catalytic converter enhance environment-friendly performance. Exhaust gases are further filtered by a honeycomb type catalytic converter, which consists of a stainless steel tube coated with platinum and rhodium.

♦   The first three section semi-double cradle frame ever on a Yamaha dual purpose model adopts technology from the proven aluminium frames on the YZ250F and WR250F. It consists of cast/forged aluminium main frame mated to a high tensile steel down tube and swingarm. The result is an outstanding blend of weight balance and strength/rigidity.

♦   Plush upside down 46mm diameter fork with 270mm stroke provides excellent cushioning while the fork under-bracket is made of high-strength forged aluminium and the handlebar crown is cast aluminium for superior rigidity balance.

♦   Slim steel fuel tank is shaped for excellent knee grip. Handlebar, seating and footrest locations create a comfortable riding position for road or dirt. Seat height is lower than WR/YZ at 895mm so a wider range of riders can feel at ease. But ground clearance remains a generous 300mm for serious off road performance.

♦   Trick digital display LCD speedo has diagnostic function for fuel injection system as well as stopwatch and distance compensation tripmeter.

SPECIFICATIONS
ENGINE/IGNITION/TRANSMISSION
Type	250cc liquid-cooled DOHC 4-stroke;
Displacement - (cc)	250
Bore Stroke - (mm)	77.0 x 53.6
Compression	11.8:1
Fuel Management	Fuel Injection
Ignition	Direct ignition coil
Fueltank - (L)	7.5
Transmission	Constant-mesh 6-speed;multiplate wet clutch
CHASSIS
Length - (mm)	2174
Width - (mm)	810
Height - (mm)	1229
Seat Height - (mm)	929
Wheelbase - (mm)	1419
Clearance - (mm)	300
Wet Weight	125kg with 7.5 litres of fuel
FRONT END
Suspension Front	Inverted fork; fully adjustable, 270mm travel
Tyres Front	80/100-21
Brakes Front	Hydraulic single-disc brake, 250mm
REAR END
Suspension Rear	Single shock; fully adjustable, 270mm travel
Tyres Rear	120/80-18
Brakes Rear	Hydraulic single-disc brake, 230mm