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It reverberates
like thunder and strikes like lightning.
It's the RM-Z250, the four-stroke motocross
weapon that's been taking the competition
apart. The RM-Z250 has it all. An incredibly
wide and strong powerband that lets
you launch out of corners. Optimum engine
braking. Exceptionally easy starting
hot or cold. And a lightweight design
for precision handling on the toughest
tracks.
The RM-Z250 for 2005:
it's taking the four-stroke world by
storm!
Straighter exhaust
ports and extended center rib for intake
ports to improve low to mid range engine
response Revised
ignition timing and rev limiter setting
for improved high rpm and over-rev performance
New clutch plate design
and improved clutch spring material
for better clutch action and feel
Improved throttle valve
design and new stainless-steel throttle
cable designed for low-friction throttle
operation
Shot-peened 3rd and
4th transmission gears for increased
durability
Stronger reinforced
airbox design for increased durability
and improved intake seal
New-design oil filter
cover for simplified oil change maintenance
- cover can be removed without removing
the water pump cover or draining coolant
Larger radiators for
increased cooling capacity and more
stable engine operating temperature
- radiators are 40mm longer with 17.8%
larger core area
More durable muffler
construction with improved packing
Steering head wall
thickness increased from 2.6mm to 3.2mm
for increased rigidity and improved handling
performance
New low-friction fork oil seals for
smoother action throughout the fork
stroke
On-the-fly clutch lever
adjuster added to clutch lever perch
for rider convenience
New front brake lever
shape for improved rider feel
Improved seat cover
material for better rider grip and new
seat foam material for improved comfort
and durability
Wider handlebar mounting
position for increased handlebar strength
and bending resistance
Front fork clamp bolt
position relocated to left/right sides
for easier fork maintenance
Compact 249cc,
4-stroke, liquid-cooled, DOHC, 4-valve
engine - designed for easy-to-ride 4-stroke
power Advanced
4-valve cylinder head design with narrow
25-degree included valve angle and titanium
valves
Cam profiles selected
for a wide powerband with strong peak
power
Composite-plated aluminum
alloy cylinder for increased durability,
optimum engine cooling and operating
temperature Forged, 2-ring piston designed
for maximum oil retention and minimal
wear, plus tin plating for added durability
Keihin FCR37 carburetor
with throttle position sensor and accelerator
pump
Automatic decompression
system for easy kick starting
Semi-dry-sump lubrication
system features separate oil chambers
for the transmission and crankshaft
using the transmission as the oil sump,
allowing low crankshaft placement, reduced
engine height and a low center of gravity
AC-CDI ignition system
with two ignition maps automatically
increases engine idle speed to reduce
engine brake effect
Five-speed transmission
featuring a ratchet-type shift mechanism
designed for light shifting effort
Magnesium cylinder head,
generator and outer clutch covers minimize
overall engine weight
Lightweight exhaust
system features a titanium and stainless
steel construction, plus a repackable
aluminum/stainless steel muffler
Lightweight perimeter-type
frame with D-shaped upper spars that
contribute to a slim design and improved
position and rider mobility
Slim bodywork allows
greater freedom of movement for the
rider
Kayaba 48mm inverted,
bladder-style front fork with special
valve system to optimize internal pressure
and damping performance throughout the
stroke
Kayaba reservoir-type
rear shock absorber with 16-way adjustable
compression and rebound damping
Rear linkage system
places the suspension load on the swingarm
instead of the frame to reduce frame
weight, and allows smoother movement
of the rear shock and linkage for improved
rear wheel traction
Aluminum swingarm with
tapered hydro-formed beams, forged axle
holder, plus cast and forged linkage
components
Front disc brake system
consists of a dual-piston caliper with
27mm pistons, master cylinder with large
11mm piston and thin Kevlar brake line
for reduced weight and progressive brake
feel
Lightweight rear brake
system includes a dual piston caliper
with 25.4mm pistons and durable forged
brake pedal
Aluminum skid plate
with plastic side guards and aluminum
engine mounting plates
| Engine: | 249cc, four-stroke, single-cylinder, liquid cooled, DOHC, 4-valve |
| Bore Stroke: | 77.0 x 53.6mm |
| Compression Ratio: | 12.6:1 |
| Fuel System: | KeihinT FCR37 |
| Lubrication: | Semi-dry sump |
| Ignition: | Digital AC-CDI |
| Transmission: | 5-speed |
| Final Drive: | #520 chain |
| Overall Length: | 2170 mm (85.4 in) |
| Overall Width: | 840 mm (33.1 in) |
| Overall Height: | 1270 mm (50.0 in) |
| Seat Height: | 960 mm (37.8 in) |
| Ground Clearance: | 340 mm (13.4 in) |
| Wheelbase: | 1475 mm (58.1 in) |
| Dry Weight: | 92.5 kg (204 lbs) |
| Suspension Front: | Telescopic, cartridge-type, 16 compression & rebound settings, 11.8 inches, 300mm of wheel travel |
| Suspension Rear: | Link-type, spring preload fully-adjustable, 16 compression & rebound settings, 310 of wheel travel |
| Brakes Front: | Single hydraulic disc |
| Brakes Rear: | Single hydraulic disc |
| Tires Front: | 80/100-21 51M |
| Tires Rear: | 100/90-19 57M |
| Fuel Tank Capacity: | 7.5 liter (2.0 gal.) |
| Color: | Yellow |
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