HYOSUNG Sense SD-50 Service Manual page 59

3-37 ENGINE
● Install the piston rings on the piston.
∙1st - Keystone ring
∙2nd - Rectangular ring
�Expander ring
NOTE:
Position the ring so that the marking is on upside.
● It is extremely important that, when the piston is fed into the
cylinder, each ring in place should be so positioned as to hug
the locating pin as shown in the illustration.
● Apply engine oil on the piston pin and install the piston to the
conrod.
NOTE:
The arrow mark ① on the piston head should point
the exhaust side.
● The circlip should be mounted in such a position ② that the
mating ends of the circlip do not coincide with the groove por-
tion of the piston.
● Position the cylinder base gasket.
● Apply engine oil on the piston and cylinder wall surfaces and
install the cylinder over the piston carefully.
● Tighten the cylinder head nut to the specification.
Tightening torque
8-12 N∙m
(0.8-1.2 kg-m, 6.0-8.5 lb-ft)
Locating pin
CORRECT INCORRECT
①
②
Outside