Honda CRF450L 2019 User Manual

Servicing Your Honda 99
Piston/Piston Rings/Piston Pin
We recommend you consult an official Honda
Service Manual or your dealer for correct Service
Limit measurements.
1. Remove the carbon deposits from the piston
head and piston ring grooves.
NOTICE
Do not damage the piston when removing the
carbon deposit.
2. Apply engine oil to each piston ring whole
surface.
3. Install the spacer (1) first, then install the side
rails (2) to the piston (3).
4. Install the second ring (4) to the piston with
"RN" mark (5) side facing up.
5. Install the top ring (6) to the piston with “1R”
mark (7) side facing up.
NOTICE
Do not damage the piston ring by spreading the
ends too far.
Do not damage the piston during piston ring
installation.
6. After installing the piston rings they should
rotate freely, without sticking. Space the ring
end gaps 120 degrees apart between top ring,
second ring and spacer. Space each ring end
gap 0.8 in (20 mm) or more apart between
upper side rail, spacer and lower side rail as
shown.
Piston/Piston Pin/Piston Ring Inspection Piston Ring Installation
(1) spacer (5) “RN” mark
(2) side rails (6) top ring
(3) piston (7) "1R" mark
(4) second ring
(6)
(4)
(1)
(5)
(1)
(3)
(7)
(4)
(6)
(2)
(2)
0.8 in (20 mm)
or more
0.8 in (20 mm)
or more
(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)