Honda HHT25S Manual page 92

9. CRANKSHAFT / PISTON / VALVES / CYLINDER BLOCK
1. CRANKSHAFT / PISTON . . . . . . . . . . . . . .
2. CYLINDER BLOCK / VALVES. . . . . . . . . . .
1. CRANKSHAFT / PISTON
DISASSEMBLY/REASSEMBLY
Remove the lower crankcase
PISTON RING
INSPECTION: P. 9-6 and 7
REASSEMBLY:
• Install the second ring with the " • " or "R" mark
facing up.
• Do not interchange the top ring and the second ring.
• After assembly, check for smooth movement of the
piston ring.
• Stagger the piston ring end gaps 120° apart, do not
align with the piston pin.
• Space the side rail end gaps at least 10 mm (0.4 in)
apart. Coat the oil ring with oil after assembly.
TOP RING
(WHITE CIRCUMFERENCE)
SECOND RING
(BLACK CIRCUMFERENCE)
OIL RINGS SIDE RAIL
(COMBINATION SPACER
RINGS) SIDE RAIL
" or " R" MARK
•
"
SECOND RING
OIL RINGS
(COMBINATION
RINGS)
,
P. 8-5 P. 8-11.
TOP RING
120°
120°
120°
10 mm
(0.4 in)
10 mm (0.4 in)
3. INSPECTION . . . . . . . . . . . . . . . . . . . . . . . .
9-1
4. ROCKER ARM/VALVE LIFTER . . . . . . . . .
9-5
TIMING BELT
INSTALLATION: P. 9-4
INSTALLATION:
Check that the belt is not
worn or cracked. Do not
bend or twist the belt.
PISTON PIN
DISASSEMBLY/
DISASSEMBLY
P. 9-
REASSEMBLY: REASSEMBLY:P. 9-2
2
INSPECTION: P. 9-7
CRANKSHAFT
INSPECTION: P. 9-4
INSPECTION:
REASSEMBLY:P. 9-4
REASSEMBLY:
12 x 24 x 5 mm
OIL SEAL
9-11
P. 9-4
CARBURETOR SIDE
PISTON
INSPECTION: P. 9-6 and 7
INSPECTION: P. 9-6, P. 9-7
REASSEMBLY:
REASSEMBLY: P. 9-2
Δ
Install with the " " mark
on the piston head facing
the carburetor side.
Δ
" " MARK
10 x 20 x 5 mm OIL SEAL
REASSEMBLY:P. 9-4
INSTALLATION: P. 9-4
P. 9-4
P. 9-4
9-1
9-6