Honda CRF450L 2019 User Manual

92 Servicing Your Honda
Valve Clearance
1. Lift the rocker arms (1) up and install the
newly selected shims (2) on the valve spring
retainers (3).
NOTICE
Do not let the shims fall into the crankcase.
2. Check the operation of the plunger (4) by
turning the decompressor weight (5) with your
finger. The plunger should be retracted and
protruded smoothly.
If the operation is not smooth, refer to an official
Honda Service Manual (page 194) for
decompressor disassembly or see your dealer.
3. Make sure the piston is at TDC on the
compression stroke (page 88).
4. Apply molybdenum disulfide oil (a mixture of
1/2 engine oil and 1/2 molybdenum disulfide
grease containing more than 3% molybdenum
disulfide additive Moly Paste 77) to the
following parts.
– camshaft cam lobes
– plunger whole surface
5. Install the camshaft (6) onto the cylinder head
with the decompressor weight (5) facing up as
illustrated below.
6. Install the cam chain (7) over the cam sprocket
(8).
While holding the left camshaft bearing (9) to
the left fully, install the camshaft (6) onto the
cylinder head (10) and slide the left camshaft
bearing to the right fully.
Camshaft Installation
(1) rocker arms (3) valve spring retainers
(2) shims
(1)
(1)(2) (3) (3)
(3)(2)
(2)
(4) plunger
(5) decompressor weight
(5)
(4)
(5) decompressor weight (8) cam sprocket
(6) camshaft (9) left camshaft bearing
(7) cam chain (10) cylinder head
(7)
(8)
(5)
(9)
(10)
(6)

Honda CRF450L 2019 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Fuel System	Programmed Fuel Injection (PGM-FI), 46mm throttle body
Transmission	6-speed
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-18
Rake (Caster Angle)	28.5°
Wheelbase	58.9 inches
Seat Height	37.1 inches
Fuel Capacity	2.0 gallons
Ignition	Full transistorized ignition
Ground Clearance	12.4 inches
Front Suspension	49mm inverted fork; 12.0 inches of travel
Rear Suspension	Pro-Link Showa single shock, adjustable spring preload, compression and rebound damping
Front Brake	Single 260mm disc
Curb Weight	289 pounds
Valve Train	Unicam four-valve
Final Drive	Chain
Trail	4.6 inches (118mm)