Section 04 ENGINE
Subsection 04 (DISASSEMBLY/ASSEMBLY)
04-04-2 MMR2000_119_04_04A.FM
TOP END REMOVAL
Remove the following then lift cylinder head no. 10:
– carburetor
– exhaust system
– spark plug no. 4
– cylinder head cover no. 2
– cylinder head nuts no. 11
NOTE: When removing cylinder head, mark both
push rods no. 12 for reassembly.
TYPICAL — MECHANIC REMOVING CYLINDER HEAD
1. Cylinder head
2. Mark both push rods for reassembly
Pull out push rods.
CLEANING
Discard all gaskets.
Clean all metal components in a non-ferrous metal
cleaner.
Scrape off carbon formation from cylinder exhaust
port, cylinder head, valves no. 6 and piston dome
using a wooden spatula.
NOTE: The triangular mark on the piston dome
must be visible after cleaning.
Clean the piston ring grooves with a groove clean-
er tool, or with a piece of broken ring.
DISASSEMBLY
NOTE: Before disassembling, mark valve springs
no. 7, valves no. 6 and rocker arms no. 5. This will
ensure that parts will not be inverse at reassem-
bly.
Unscrew rocker arm pivot lock nuts no. 9 and rocker
arm pivots no. 8. Remove them.
Remove both rocker arms no. 5.
TYPICAL — MECHANIC REMOVING ROCKER ARM OF INTAKE
VALVE
1. Rocker arm pivot
2. Rocker arm pivot lock nut
3. Rocker arm
Push down and slide the spring retainer no. 13 to
the side, so the valve stem slips through the hole,
as shown in the next photo.
TYPICAL — PUSH DOWN AND SLIDE RETAINER TO THE SIDE
A31C25A
1
2
A31C26A
2
1
3
A31C27A
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