Honda CRF450L 2019 User Manual

Valve Clearance
(cont’d)
Servicing Your Honda 89
1. Set the piston at TDC on the compression
stroke (page 88).
2. Measure the intake valve clearances by
inserting a feeler gauge (1) between the intake
rocker arms (2) and camshaft cam lobes (3).
NOTICE
Be careful not to damage the intake rocker arms.
Valve Clearance:
3. Measure the exhaust valve clearances by
inserting a feeler gauge (1) between the
exhaust rocker arms (4) and shims (5).
Valve Clearance:
If intake valve clearance and exhaust valve
clearance need adjustment, see Camshaft Removal
(this page) and select the correct shim for each
valve.
1. Record the intake valve and exhaust valve
clearances (this page).
Make sure the piston is at TDC on the
compression stroke (page 88).
2. Remove the cam chain tensioner lifter cover
bolt (1) and sealing washer (2).
Valve Clearance Inspection
(1) feeler gauge (3) camshaft cam lobes
(2) intake rocker arms
IN: 0.004 ± 0.001 in (0.11 ± 0.03 mm)
(2)
(1)
(3)
(3) (1)
(3)
(2)
(1) feeler gauge (5) valve shims
(4) exhaust rocker arms
EX: 0.011 ± 0.001 in (0.28 ± 0.03 mm)
(1)
(4)
(5)
(5)
(1)
(4)
(5)
(4)
Camshaft Removal
(1) cam chain tensioner lifter cover bolt
(2) sealing washer
(1)
(2)

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)