12.2 Fault Diagnosis 
Low compression pressure        Noisy cylinder head 
Improperly adjusted valve clearance                Improperly adjusted valve clearance 
Valve burnt or bent   Valve spring hurt 
Poorly sealed valve race              Too high compression pressure 
Air leakage at cylinder head              Too much carbon deposited in the combustion chamber 
Improperly installed spark plug   
   
12.3 Cylinder Head 
12.3.1 Removal 
Screw off the ten locknuts and remove cylinder cover. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Remove cylinder cover hood. 
Screw off two locknuts and remove the rocker arm, return spring 
and rocker arm shaft. 
 
 
 
 
 
 
 
 
Cylinder cover 
Bolt 
Rocker arm 
Return spring 
Cylinder cover hood  Bolt 
Rocker arm shaft