වැඩිදුර තොරතුරු දැන ගැනීම සඳහා පහත videos නරඹන්න.
( Watch the following videos to gain a better understanding. )

Spark plug reading & analysing -    • How to select a spark plug for best p...  
Emission test analysing part 1 -    • Reason for failing emission test  
Emission test analysing part 2 -    • How to analyse emission test part 2