13.4 Piston 
13.4.1 Removal 
Remove piston pin retainer. 
* Attention: Please do not drop the retainer into crankcase 
during removal. 
Take out piston pin and remove piston. 
 
 
 
 
 
 
Remove piston ring. 
Inspect piston, piston pin and piston ring. 
* Attention: Please do not break or hurt piston ring. 
Remove deposited carbon inside the piston ring. 
 
 
 
 
 
 
Install the piston ring. 
Measure the clearance between piston ring and piston ring 
groove. 
Allowable limit:    Top ring: 0.09mm. 
  Second ring: 0.09mm. 
 
 
 
 
 
 
 
Remove piston ring and install all the piston rings onto bottom 
of cylinder. 
* Attention:Compress piston rings into the cylinder with 
piston head. 
Measure the joint clearance between piston rings. 
Allowable limit: 0.5mm. 
 
Piston pin ring, piston pin 
Testing gauge 
Piston 
Push 
Piston ring
 
Testing gauge 
Piston ring