Royal Alloy GP125S, Maintenance Manual

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Reassembly attention:
(1). Routine installation: A little lubricant is applied to the parts before assembly.
(2). The piston pin should be missed out of the piston gap. The piston top arrow points to the exhaust direction.
(3). If you only need to replace the gasket (shown no.6), you must measure its thickness by using the vernier caliper and
then choose the same thickness gasket (shown no.6).
(4). If the crankshaft, the crankcase, the piston and the cylinder are replaced at the same time or part, do not install the
sealing gasket, press the cylinder with auxiliary tools, measure the height from the upper plane of the cylinder to the top
of the piston, and select the thickness of the sealed gasket according to the table below.
Thickness grouping of cylinder seal
Engine capacity Volumetric compression ratio measured data thickness of the liner
125CC 12.0:1
1.05
～
1.2 0.3
1.2
～
1.4 0.4
1.4
～
1.55 0.5
200CC 11.6:1
-1.35
～
-1.2 0.3
-1.2
～
-1.0 0.4
-1.0
～
-0.85 0.5