Compression Pressure Measurement; Checking Ignition Timing - PGO PMX Sport 50 Service Manual

(6)Compression pressure measurement:

1.Measure it when the engine is warm.
2.Open the seat, remove the luggage.
3.Remove the cover.
4.Remove spark plug then place comp-
Ression pressure gauge.
5.Fully open the throttle, kick on kickstarter 5
Times continuously, measure the compression
Pressure.
6.Compression pressure:
110cc: 7kg/c ㎡-500rpm
50cc: 6kg/c ㎡-600rpm
7.when the compression pressure is too low, check
the following:
a. cylinder head gasket cracked.
b. piston cylinder worn out.
c. piston ring worn out.
8.If the comperssion pressure is too high it is due
To carbon piled up on combustion chamber and
Piston tip.
(7) lgnition timing:
This scooter is using CDI set, it is no need to adjust ignition timing.
If ignition timing is not correct, check the CDI sets AC magneto, change it if it is abnormal.

checking ignition timing:

1.Open the seat, remove the luggage compartment
2.Remove the body cover
3.Remove fan case.
4.Check with ignition timing lamp.
keep the engin running at 1,900 ±100 r.p.m
If the checking mark should lay in ±3 apart
From "F", mark.
5.ignition timing: B.T.D.C.
17° ±3° / @ 1900rpm