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Sym HD 125 Service Manual

Sym HD 125
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7. CYLINDER/PISTON
7-7
Piston Installation
Install piston and piston pin, and place the IN
marks on the piston top side forward to intake
valve.
Install new piston pin snap ring.
Caution
y Do not let the opening of piston pin snap ring
align with the opening piston ring.
y Place a piece of cloth between piston and
crankcase in order to prevent snap ring from
falling into crankcase as operation.
Cylinder Installation
Clean up all residues and foreign materials on
the matching surface of crankcase. Pay
attention to not let these residues and foreign
materials fall into crankcase.
Caution
Soap the residues into solvent so that the
residues can be removed more easily.
Install dowel pins and new gasket.
Coat engine oil to inside of cylinder, piston and
piston rings.
Care to be taken when installing piston into
cylinder. Press piston rings in one by one as
installation.
Caution
Do not push piston into cylinder forcefully
because piston and piston rings will be
damaged.
Install coolant hose onto cylinder.
Install cylinder head (refer to Chapter 6).
Coolant hose
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Sym HD 125 Specifications

General IconGeneral
Fuel SystemCarburetor
Rear BrakeDrum
Front SuspensionTelescopic Fork
IgnitionCDI
Engine124.6 cc, 4-Stroke, Air-Cooled
Cooling SystemAir Cooled
Bore x Stroke52.4mm x 57.8mm
Starting SystemElectric & Kick

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