What I always did up to now to check if my spark plug was doing fire :
- Remove it.
- Keep it plugged into the spark plug cable.
- Ground it on the frame.
- Start and check if sparks happen.
- If they are blue, the spark plug is ok. Else if the sparks are yellow or there is no spark at all then the spark plug is bad.
While this method may work in most of the case, it does assume that the wiring/spark plug cable etc. are doing their job properly.
Basically, I'm looking for a way that would confirm that I get no fire because the spark plug are bad and not because there is any other background problem such as bad spark plug cable etc.
Is there any other way to check if a spark plug is working properly so I can eliminate the case of bad spark plug when I get no fire ?