Honda CRF450L 2019 User Manual

88 Servicing Your Honda
Valve Clearance
1. Remove the right crankcase over cover
(page 83).
2. Remove the crankshaft hole cap (1).
3. Remove the spark plug (page 86).
4. Remove the cylinder head cover (page 87).
5. Rotate the crankshaft by turning the primary
drive gear bolt (2) clockwise until “T” mark (3)
on the primary drive gear aligns with the index
mark (4) on the clutch cover. In this position,
the piston may either be on the compression or
exhaust stroke at TDC. If the primary drive
gear passed the “T” mark, rotate the primary
drive gear bolt clockwise again and align the
“T” mark with the index mark.
Make sure that the decompressor weight (5) is
upper position.
6. Check the timing marks (6) on the cam
sprocket aligns with the camshaft holder
mating surface (7) of the cylinder head.
7. The inspection must be made when the piston
is at the top of the compression stroke when
both the intake and exhaust valves are closed.
This condition can be determined by moving
the rocker arms (8).
Positioning At TDC On The
Compression Stroke
(1) crankshaft hole cap
(1)
(2) primary drive gear bolt
(3) “T” mark
(4) index mark
(5) decompressor weight
(2)
(3)
(4)
(5)
crankshaft side: camshaft side:
(6) timing marks
(7) camshaft holder mating surface
(8) rocker arms
(6)
(7)
(8)
(8)

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)