Honda UMK450T Manual page 49

62VL510X.book 5 ページ ２０１９年２月８日 金曜日 午後１時１１分
CRANKSHAFT/PISTON
REMOVAL/INSTALLATION
Remove the lower crankcase (page 11-2).
PISTON RING
INSTALLATION:
· Install the top ring and second ring with the "N" 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
SECOND RING
(White paint on the
circumference)
SIDE RAIL
OIL RING
SPACER
(COMBINATION
RING)
SIDE RAIL
"N" MARK
SECOND RING
OIL RING
(COMBINATION
RING)
PISTON PIN CLIP [2]
ASSEMBLY:
· Reusing the piston pin clip may damage the
engine. Always install new piston pin clips.
· Install by setting one end of the clip in the
piston groove, holding the other end with
long-nosed pliers, and rotating the clip in.
· Do not align the end gap of the clip with the
cutout in the piston pin bore.
CLIP
120°
TOP
RING
10 mm (0.4 in)
CUTOUT
TIMING BELT
INSPECTION:
Check that the belt is not worn or
cracked. Do not bend or twist the belt.
PISTON
INSTALLATION:
Install with the "
piston head facing the
carburetor side.
PISTON PIN
CRANKSHAFT
OIL SEAL
(15 x 25 x 6 mm)
(Apply to the lip)
CRANKCASE
CARBURETOR SIDE
" on the
" " MARK
(Apply to the lip)
OIL SEAL
(10 x 20 x 5 mm)
11-5