SUZUKI'S 2008 RM-Z450
 Suzuki's
2008 RM-Z450 is the first production motocross machine to
feature electronic fuel injection.
The system, which has been tested by Suzuki's factory riders,
offers better roll on power and an improved low-to-mid range
delivery via an internal battery-less fuel pump located inside
the fuel tank and specially designed Keihin carburettor.
Other revisions to the engine include revised intake port
and cam timing which reduces intake resistance and improves
efficiency and boosts engine performance. The flywheel inertia
is also increased to produce a smoother revving engine and
improve overall acceleration.
The combustion chamber has been redesigned for better power
output and improved low-to-mid response and a narrower intake
and exhaust valve angle, along with increased squish areas,
improve air and fuel mixing.
The five-speed gearbox also has an all new link type shifting
mechanism.
Other changes include an all-new frame, which is lighter
and has improved rigidity balance for better handling. A new
Showa rear shock features a redesigned damper case and modified
internal structure for a better controlled feel and increased
bottoming resistance. The rear swingarm is also redesigned
and has a thinner wall to reduce weight.
2008 RM-Z450 Specifications:
Overall length: 2185mm (86.0 in.)
Overall width: 830mm (32.7 in.)
Overall height: 1260mm (50.0 in.)
Wheelbase: 1480mm (58.3 in.)
Ground clearance: 350mm (13.8 in.)
Seat height: 955mm (37.6 in.)
Dry weight: 101.5kg (224 lbs.)
Engine type: 4-stroke, liquid-cooled, DOHC
Bore: 96.0 mm
Stroke: 62.1 mm
Displacement: 449 cm3 (cc)
Compression ratio: 12.8:1
Fuel system: KEIHIN FI 43mm
Lubrication system: Suzuki Advanced Sump System
Clutch: Wet multi-plate type
Transmission: 5-speed constant mesh
Primary reduction ratio: 2.625 (63/24)
Gear ratio Low: 1.800 (27/15), 2nd: 1.471 (25/17), 3rd: 1.235
(21/17), 4th: 1.050 (21/20), 5th: 0.909 (20/22)
Final reduction ratio: 3.846 (50/13)
Front suspension: SHOWA 47mm telescopic forks, pneumatic/coil
spring, oil damped.
Rear suspension: Swingarm, link type, SHOWA piggyback-reservoir
shock
Caster: 25?30'
Trail: 111 mm (4.4 in.)
Front brake: Disc
Rear brake: Disc
Front tyre size: 90/ 100-21
Rear tyre size: 120/ 80-19
Fuel tank capacity: 6.2 L (1.6 US gal.)
Body colour: Champion Yellow No.2 (YU1)
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