Yamaha JOG CS50 (Z) (2002) [102/204] Engine assembly and adjustment

ENG

ENGINE ASSEMBLY AND ADJUSTMENT

4-39

PISTON AND PISTON PIN

1. Apply:

• engine oil

(in the crankshaft bearing, big end bearing,

small end bearing, piston pin, piston ring

grooves and piston skirt areas).

2. Install:

• reed valve gasket

• reed valve 

• carburetor joint 

3. Install:

• small end bearing

• piston 

• piston pin 

• piston circlips 

NOTE:

• The arrow  of the piston should point to

the exhaust side.

• Before installing the piston circlip, cover the

crankcase with a towel or clean cloth so

that the circlip and other materials do not

accidentally fall into the crankcase.

• Always use new piston circlips.

CYLINDER AND CYLINDER HEAD

1. Install:

• cylinder gasket (Use a new gasket)

2. Check:

• piston rings

NOTE:

• Ensure that the ends of the rings are

correctly coupled around the centring devi-

ces  on the piston grooves.

Carburetor joint

9 Nm (0.9 m • kg)