Honda CB160 Shop Manual page 41

3. 8 CRAN"SHAFT, CONNECTING RODS, AND PISTONS
4. Measurement of piston pin hole (Refer to Fig.
3. 99).
Standard value
Correction limit
eare
When above
mm, replace-
ment shaud be
made.
5. For oversize pistons, there ore three ot intervals
of 0.25 mm.
6. Measurement of the piston outside diameter.
I
Standard value
I
Correction limit
Outside
diameter
(CB
125. 1601
Ill.
Assembly
l . At instollotion, the arrow mark ot the piston head
should be faced in the forward direction. (Refer
to Fig. 3. l 00)
(CAUTION)
Core should be token · since reversal of direction
causes the piston head to contact the valves.
2. For fitting of the piston pin, piston, ond piston
end of the connecting rod, o normal temperature
float system is employed. Hence, fitting should
be such that light monuol pressure ot normal tem-
perature is sufficient for insertion. (Refer to Fig.
101)
3. Avoid the use of piston rings which hove lost
their temper ; use new piston rings.
D. Description of piston rings
Of the steel rings, _ _ hard chrome plating is applied
to the top ond second, and porkerizing is applied
to the oil ring. The top ond second rings ore
compression rings ond the oil ring · is for scraping
down oil on the cylinder wall. All transmit piston
heat to the cylinder wall.
( l I As the top ring is especially opt to wear due
to high temperature, hard chrome plating· is applied
for increasing wear resistance.
(2) At the second ring, the contact surface wi!h the
cylinder is reduced for increasing the tension per
unit oreo ; smooth fitting is obtained in o short
period.
(31 The oil ring hos on indented shape suitable for
scraping oil down.
Fig. 3. 99 Measuring piston pin hale
Fig. 3. 100 Mark an piston head
Fig. 3, 101 f;tting piston pin
TOP RtNG
1::l
============::Si•~~~
SECOND
RING
OIL RING
Fig.
3. 102 Secnanal v;ew of piston rings
37