Honda CRF450L 2019 User Manual

Servicing Your Honda 101
Piston/Piston Rings/Piston Pin
1. Clean the cylinder mating surfaces (1) of the
crankcase, being careful not to let any material
fall into the crankcase.
2. Remove the shop towels.
3. Apply liquid sealant (TB1141G manufactured
by ThreeBond or equivalent) to the cylinder
mating surface of the crankcase side as shown.
4. Install the dowel pins (2) and a new cylinder
gasket (3).
NOTICE
Do not let the dowel pins fall into the crankcase.
5. Apply engine oil to the cylinder bore (4),
piston outer surface and piston rings (5). Route
the cam chain (6) through the cylinder. Install
the cylinder over the piston rings by hand
while compressing the piston rings.
NOTICE
Do not damage the piston rings and cylinder bore.
Do not let the cam chain fall into the crankcase.
Cylinder Installation
(1) cylinder mating surface
0.2 – 0.4 in
(5 – 10 mm)
0.2 – 0.4 in
(5 – 10 mm)
(1)
(2) dowel pins (3) cylinder gasket (new)
(2)
(3)
(4) cylinder bore (6) cam chain
(5) piston rings
(6)
(5)
(4)

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)