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The CRF450RX Enduro’s 449cc engine is very powerful, while still
offering its trademark progressive, usable power and torque delivery throughout the range.
Compression ratio is set at 13.5:1 with bore and stroke of 96mm x 62.1mm.
A four-valve Unicam cylinder head, with a finger rocker arm on the inlet valves,
gives inlet valve lift of 10mm; exhaust valve lift is 8.8mm. Inlet valve diameter is
38mm and 2-way valve seat machining smooths gas flow.
The downdraught intake provides a direct, straight shot to the inlet ports.
The valve springs are oval in cross section, reducing height to allow for
more compact head dimensions. Narrow valve angles of 9° intake and 10.5°
exhaust, plus a flat-topped piston,
boost combustion efficiency. A 4-hole piston oil jet reduces piston temperature
and deals effectively with the increased temperatures generated by the high
Both the piston pin and finger rocker arms have a DLC coating (Diamond-like Carbon),
which has excellent abrasive resistance and durability, while also reducing
The engine uses a scavenge pump to distribute oil for both transmission and clutch,
reducing friction, improving lubrication efficiency and reducing pumping losses.
Oil capacity is 1250cc with one sump storing oil for engine, clutch and gearbox.
The compact clutch spins 7 friction disks and the 6 centre plates feature
a special surface friction material.
A 2mm clutch plate dissipates heat efficiently while judder springs generate a good
connection feeling on the clutch.
There is a five ratios gearbox and the final drive is handled by 13 and 51-tooth sprockets.
The standard-fitment final drive chain is of the O-Ring type to improve reliability
and performance in the most demanding conditions.
The rider controls and displays are rationalised together and sited on the left handlebar;
EFI warning, plus EMSB mode button with LED indicator.
The engine start button for the standard-fitment electric starter,
fundamental for the enduro rider as it makes restarting a stalled engine much easier,
is located on the right side of the handlebar.
The new heavy duty hand guards are light and their innovative
design guarantees maximum protection.
Honda’s EMSB puts instant engine character adaptability at the rider’s command.
With the machine stopped, and engine at idle, a simple press and
hold of the button for just under a second selects the next map in sequence.
The LED built into the button signals the map in use with a quick press and
number of subsequent flashes (1 flash for Mode 1, etc).
If a new map is selected the choice is also confirmed to the rider.
Mode 1 (Aggressive) delivers the power in the most responsive way.
Mode 2 (Enduro) tones down engine performance (especially useful for
a tired rider or slippery tracks) while Mode 3 (Extreme) is even less responsive
and more linear, making the engine’s power much more usable in a wide range
of exreme conditions like the ever more present “extreme test” trails.
To complete the standard equipment, the CRF 400RX Enduro has a
useful radiators protection kit and the electric fan.
The CRF450RX Enduro uses the seventh generation CRF aluminium beam
frame with improved turning performance, front-end stability and traction.
It also delivers greater rear wheel drive with elevated levels of rider
feedback and predictability.
Tapered main spars offer the perfect mix of lateral stiffness and torsional stiffness,
to improve turning ability and feel.
The extruded rear subframe helps lower the overall weight.
The wheelbase of the seventh generation chassis of the CRF450RX
Enduro 2018 is 1477mm. Distance between the front wheel axle and
swingarm pivot is 913mm, with distance from swingarm pivot to rear axle only 564mm.
This geometry with a lower C of G transfers more weight to the rear wheel
for outstanding traction, a key aspect of the development of the RX Enduro.
Rake and trail are set at 27.4°/117mm. Total wet weight
(including 7.3 liter of fuel) is 116,2kg.
A new strong skid plate helps protect the frame from accidental hits,
to further increase the CRF450RX Enduro reliability.
The CRF450RX Enduro is a slim, compact machine that’s easy to manage
thanks to the low centre of gravity.
Its rear tyre is loaded hard to dig for drive, matching the front end’s grip level
and feel for traction at the limit.
And Honda’s enduro machine is equipped with a fully adjustable 49mm
Showa USD coil spring fork – based the Showa factory fork used in the
Enduro World Championship.
The cylinder features a 25mm diameter, with a 14mm rod and 39mm compression piston.
It is effectively a race-spec suspension.
The fully adjustable Showa rear shock is mounted low and on the centre-line
of the machine for optimal mass centralisation and high-speed stability.
Its spring rate is 52N/mm. The swingarm is 599mm long.
A 260mm wave-pattern front disc delivers effective heat dissipation,
power and feel from the two-piston brake caliper working it; a matching 240mm
wave-pattern disc and single-piston caliper is at the rear.
Lightweight aluminium rims, with directly attached spoke pattern layout reduce unsprung weight;
the front is 21 x 1.6in, the rear 18 x 2.15in. Fitted as standard equipment are the
Enduro World Cup, Metzeler Six Days Extreme tyres: 90/90-21 front and 140/80-18 rear.
There is a plastic 7,3L tank, necessary to take on European enduro races.
New plastics with smooth external lines help the rider move easily around the
machine and the machine’s narrow frontal area is is identical to that of its cross sibling.
The front mudguard directs an efficient funnel of air to the radiator.
A larger tank kit (including tank, fuel cap and air scoop) to increase range
is available at a favorable price.
The standard digital speedometer with integrated hour counter is a reliable
and very useful tool to keep track of the distances and to plan an appropriate
The CRF450RX Enduro has full electrics that include ‘full LED’ headlights
and indicators to improve visibility and reduce consumption.
Headlights and indicator design is modern and aggressive.
A beautiful bike, the CRF450RX Enduro has a lean bodywork that uses durable
film inset with ‘Works Replica’ graphics that cover a wide area with scratch resistant style.
The new sturdy back mudguard has an integrated support for the registration plate,
that also increases the resistance to the hits, typical of heavy off road use.
The Exhaust system is characterised by the beautiful carbon fiber muffler caps.
The forged aluminium sidestand tucks high out of the way and attaches
to the frame at the left footpeg mount via a stainless steel bracket.
As always, homologation to be road legal, and the relative set up with lights,
mirrors, indicators and plate holder, are handled by RedMoto S.r.l.,
Honda Motor Europe Ltd Italia partner for CRF range distribution in Italy.
8.5 Litres fuel tank kit