15
3.Swirl the when spark plug and tighten to 18～20N.m by box key ,then
fix the spark plug cap when assembling.
2.3 Inspection of cylinder, piston and piston ring
Camshaft lube is injected by a hole of engine body into
cylinder ,so the hole must not jam.It is necessary to fix the cushion
and adjer without dust permeated into the crank case before assembly.
item
standard value:mm limit value:mm
bore diameter of cylinder
102～102.03
102.1
taper 0.0040 0.005
out of roundness 0.0035 0.005
cylinder
degree of toruosity 0.04 0.06
external diameter of piston
101.95～101.97
101.92
bore diameter of piston pin
hole
22.002～22.010
22.010
gap between piston pin and
piston pin hole
0.007～0.020
0.02
Piston ring
end
clearance
Top ring/the
second ring
0.25～0.40
0.5
oilring
0.3～0.9
1.2
top ring
0.3～0.07
0.10
gap between
piston ring
and piston
groove the second
ring
0.02～0.06
0.09
gap between cylinder and
piston
0.03～0.08
0.09
Piston,piston
ring and
piston pin
external diameter of piston
pin
21.995～21.990
21.96
bore diameter
22.016～22.027
22.03
connecting
rod
Gap between small end of
connecting rod and piston
pin
0.016～0.033
0.035
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