Honda CRF450R 2011 User Manual

Piston/Piston Rings/Piston Pin
(cont’d)
Servicing Your Honda 81
Piston/Piston Rings/Piston Pin
1. Clean the area above the engine before
disassembly to prevent dirt falling into the
engine.
2. Drain the radiator coolant after cooling the
motorcycle (page 147).
3. Remove the seat and hang the fuel tank (pages
37, 38).
4. Remove the muffler (page 105) and subframe
(page 40).
5. Remove the exhaust pipe (page 107).
6. Remove the spark plug (page 71).
7. Remove the cylinder head cover (page 72).
8. Set the piston at TDC on the compression
stroke (page 72).
9. Remove the camshaft holder, camshaft, valve
lifters and shims (page 74).
10. Disconnect the ignition coil connectors (1) and
unclamp them from the clamp (2).
Remove the bolt and washer (3).
11. Remove the bolt (4), ground wire (5) and
ignition coil/stay (6).
12. Disconnect the ECT sensor connector (7).
13. Loosen the radiator hose clamp screw (8) and
disconnect the radiator hose (9).
Cylinder Head Removal
(1) ignition coil connectors (3) bolt and washer
(2) clamp
(4) bolt (6) ignition coil/stay
(5) ground wire
(3)
(2)
(1)
(5)
(4)
(6)
(7) ECT sensor connector
(8) radiator hose clamp screw
(9) radiator hose
(7)
(9)(8)
CRF450R.book Page 81 Thursday, July 8, 2010 9:34 AM

Honda CRF450R 2011 Specifications

General

Engine Type	449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke	96.0mm x 62.1mm
Compression Ratio	12.0:1
Transmission	Close-ratio five-speed
Final Drive	#520 chain; 13T/48T
Front Brake	Single 240mm disc with twin-piston caliper
Rear Brake	Single 240mm disc
Front Tire	80/100-21
Rear Tire	120/80-19
Trail	114mm (4.5 inches)
Induction	PGM-FI, 46mm throttle body
Front Suspension	48mm inverted with rebound and compression damping adjustability; 12.2 inches travel
Rear Suspension	Pro-Link single shock with rebound and compression damping adjustability; 12.4 inches of travel
Wheelbase	58.7 inches
Seat Height	37.6 inches
Fuel Capacity	1.5 gallons