Honda CRF450RX 2020 User Manual

Air Cleaner
(cont’d)
Servicing Your Honda 67
Air Cleaner
Refer to Important Safety Precautions on page 23.
The air cleaner uses polyurethane inner and outer
pieces which can’t be separated.
A dirty air cleaner will reduce engine power.
Proper air cleaner maintenance is very important
for off-road vehicles. A dirty, water-soaked, worn-
out, or defective air cleaner will allow dirt, dust,
mud, and other impurities to pass into the engine.
Service the air cleaner more frequently if you ride
in unusually wet or dusty areas. Your dealer can
help you determine the correct service interval for
your riding conditions.
Your CRF’s air cleaner has very specific
performance requirements. Use a new Honda
Genuine air cleaner specified for your model or an
air cleaner of equal quality.
Using the wrong air cleaner may result in
premature engine wear.
Proper air cleaner maintenance can prevent
premature engine wear or damage, expensive
repairs, low engine power, poor gas mileage, and
spark plug fouling.
Improper or lack of proper air cleaner
maintenance can cause poor performance and
premature engine wear.
1. Remove the seat (page 34).
2. Remove the air cleaner retaining bolt (1) and
air cleaner assembly (2).
3. Remove the air cleaner element (3) from the air
cleaner holder (4) by releasing the hole (5) of
the air cleaner element from the holder tab (6).
Cleaning
(1) air cleaner retaining bolt
(2) air cleaner assembly
(3) air cleaner element (5) hole
(4) air cleaner holder (6) holder tab
(1)
(2)
(5)
(6)
(3)
(4)

Honda CRF450RX 2020 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	13.5:1
Induction	Programmed Fuel Injection (PGM-FI), 46mm throttle body
Ignition	Full transistorized ignition
Transmission	5-speed
Final Drive	Chain
Front Brake	Single 260mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-18
Wheelbase	58.3 inches
Seat Height	37.8 inches
Ground Clearance	12.9 inches
Starter	Electric
Trail	4.6 inches
Front Suspension	49mm inverted fork with rebound and compression damping adjustability; 12.0 inches travel
Rear Suspension	12.4 inches of travel
Valve Train	Unicam, four-valve