Reading plugs

daman

New member
Joined
May 2, 2003
Messages
10,569
Age
55
Location
Bad Axe,Michigan
I found this,,don't know if it's a repost but interesting;

23677.jpg
 
You could agree with most of that.

Starting on the left the last one before the top – not sure about that one and top statement I’d question on a 2/ engine.

The three boxes pointing at the arm I’d question as well. We have found it actually acts as a jetting guide as well, not plug range selection. The further it is black towards the end the richer the engine is. As the line moves right – it shows leaner. The position in the picture is good jetting.

Naturally changing the plug range would move the mark as well.

Spotting this is quite easy on a race specific engine with a properly performed plug chop
 
RJH said:
You could agree with most of that.

Starting on the left the last one before the top – not sure about that one and top statement I’d question on a 2/ engine.

The three boxes pointing at the arm I’d question as well. We have found it actually acts as a jetting guide as well, not plug range selection. The further it is black towards the end the richer the engine is. As the line moves right – it shows leaner. The position in the picture is good jetting.

Naturally changing the plug range would move the mark as well.

Spotting this is quite easy on a race specific engine with a properly performed plug chop

Yup..i noticed that too.
 


Back
Top