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Honda CRF450RX 2020 User Manual

Honda CRF450RX 2020
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Piston/Piston Rings/Piston Pin
88 Servicing Your Honda
Piston/Piston Rings/Piston Pin
Refer to Important Safety Precautions on page 23.
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 163).
3. Remove the seat and hang the fuel tank to the
left of the frame (pages 34, 35, 37).
4. Remove the left and right mufflers (page 126).
5. Remove the exhaust pipe (page 129).
6. Remove the subframe (page 39).
7. Remove the spark plug (page 78).
8. Remove the cylinder head cover (page 79).
9. Set the piston at TDC on the compression
stroke (page 80).
10. Remove the camshaft holder, camshaft and
shims (page 81).
11. Disconnect the ignition coil A connector (1)
and B connector (2).
Remove the ignition coil (3) by removing the
ignition coil bolts (4).
12. Disconnect the ECT sensor connector (5).
13. Loosen the radiator hose clamp screw (6) and
disconnect the radiator hose (7).
14. Remove the right radiator lower mounting bolt
(8) and washer (9).
15. Loosen the insulator band screw (10) and pull
the throttle body (11) out from the insulator
(12).
Do not hang the throttle body and support it with a
suitable strap.
Cylinder Head Removal
(1) ignition coil A connector (3) ignition coil
(2) ignition coil B connector (4) ignition coil bolts
(4)
(3)
(2)
(1)
(5) ECT sensor connector
(6) radiator hose clamp screw
(7) radiator hose
(8) right radiator lower mounting bolt
(9) washer
(5)
(6)
(7)
(9) (8)
(10) insulator band screw
(11) throttle body
(12) insulator
(10)
(11)
(12)

Table of Contents

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Honda CRF450RX 2020 Specifications

General IconGeneral
Engine Type449cc liquid-cooled single-cylinder four-stroke
Bore x Stroke96.0mm x 62.1mm
Compression Ratio13.5:1
InductionProgrammed Fuel Injection (PGM-FI), 46mm throttle body
IgnitionFull transistorized ignition
Transmission5-speed
Final DriveChain
Front BrakeSingle 260mm disc with twin-piston caliper
Rear BrakeSingle 240mm disc
Front Tire80/100-21
Rear Tire120/80-18
Wheelbase58.3 inches
Seat Height37.8 inches
Ground Clearance12.9 inches
StarterElectric
Trail4.6 inches
Front Suspension49mm inverted fork with rebound and compression damping adjustability; 12.0 inches travel
Rear Suspension12.4 inches of travel
Valve TrainUnicam, four-valve

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