Honda SH300 2006 Manual page 247

Measure the piston O.D. at the point 10 mm (0.4 in)
from the bottom and 90° to the piston pin hole.
SERVICE LIMITS: 71.90 mm (2.831 in)
Calculate the cylinder-to-piston clearance (cylinder
I.D.: page 10-5).
SERVICE LIMIT: 0.10 mm (0.004 in)
Measure the connecting rod small end I.D.
SERVICE LIMIT: 17.06 mm (0.672 in)
Calculate the connecting rod-to-piston pin clear-
ance.
SERVICE LIMIT: 0.06 mm (0.002 in)
PISTON/CYLINDER INSTALLATION
PISTON INSTALLATION
Apply engine oil to the ring grooves.
Carefully install the piston rings into the piston ring
Be careful not to
grooves with the marks facing up.
damage the piston
and rings.
• Do not confuse the top and second rings.
• To install the oil ring, install the spacer first, then
install the side rails.
Stagger the piston ring end gaps 120 degrees apart
from each other.
Stagger the side rail end gaps as shown.
CYLINDER/PISTON
90°
MARK "R"
TOP RING
120°
120° 120°
SECOND
RING
SIDE RAILS
20 mm (0.8 in) or more
10 mm (0.4 in)
MARK "RN"
SPACER
10-7