Honda CRF450X 2020, Owner'S Manual & Competition Handbook

Page: 98 / 204

Piston/Piston Rings/Piston Pin
90
Servicing Your Honda
Piston/Piston Rings/Piston Pin
Refer to Important Safety Precautions on page 31.
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 159).
3. Remove the seat and fuel tank (pages 43, 45).
4. Remove the muffler (page 127).
5. Remove the exhaust pipe (page 128).
6. Remove the subframe (page 49).
7. Remove the spark plug (page 80).
8. Remove the cylinder head cover (page 81).
9. Set the piston at TDC on the compression
stroke (page 82).
10. Remove the camshaft holder, camshaft and
shims (page 83).
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. Remove the right radiator lower mounting bolt
(5) and washer (6).
13. Loosen the insulator band screw (7) and pull
the throttle body (8) out from the insulator (9).
Disconnect the vacuum tube (10) from the
insulator.
Do not hang the throttle body and support it with a
suitable strap.
14. Remove the thermostat case mounting bolts
(11).
Remove the thermostat case assembly (12)
from the cylinder head (13).
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) right radiator lower mounting bolt
(6) washer
(7) insulator band screw
(8) throttle body
(9) insulator
(10) vacuum tube
(6) (5)
(7)
(8)
(10) (9)
(11) bolts
(12) thermostat case
(13) cylinder head
(12) (13)
(11)
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