3-19 ENGINE
REED VALVE
When reinstalling the reed valve and stopper plate to the body,
align the both cut on the reed valve and stopper plate.
Apply Thread Lock “1324”to the stopper plate securing screws.
Fix the piston ring in the piston ring groove, measure the ring side
clearance with the thickness gauge while matching the sliding sur-
faces of piston and ring.
As the piston ring wears, its end gap increases reducing engine
power output because of the resultant blow by through the enlarged
gap. Here lies the importance of using piston rings with end gaps
within the limit.
Measure the piston ring free end gap to check the spring tension.
PISTON RINGS
Check each ring for end gap, reading the gap with a thickness
gauge shown in the illustration. If the end gap is found to exceed
the limit, indicated below, replace it with a new one.
The end gap of each ring is to be measured with the ring fitted
squarely into the cylinder bore and held at the least worn part near
the cylinder bottom, as shown in the illustration.
Service limit 0.75 mm(0.030 in)
09900-20803 Thickness gauge
Service Limit
1st
2nd
3.7 mm(0.15 in)
3.5 mm(0.14 in)
STD clearance
0.020-0.060 mm
(0.0008-0.0024 in)
99000-32030 Thread Lock “1324”
