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uneven burn on plugs--significance?

F

Forden

Forum Mentor
Past Site Supporter
I've noticed (though haven't recorded a pattern yet) that plugs sometimes show uneven burn on one side vs. the other--example pics included.

Leaking valve causing uneven combustion, perhaps? anything to be much concerned about?
thanks
IMG_2276.jpg
 
Forden said:
I've noticed (though haven't recorded a pattern yet) that plugs sometimes show uneven burn on one side vs. the other--example pics included.

Leaking valve causing uneven combustion, perhaps? anything to be much concerned about?
thanks
View attachment 63638
Click to expand...

Good point...Seen this before..Are all 4 plugs are doing the same? Looks rich on one side and lean on the other..I blamed it on combustion chamber design..I tried indexing the electrodes w/shims having the open end facing the intake.Like Pro Stock Bikes..Still same results..Curious..Bike run OK ???
 
Nothing wrong with those plugs .
It's the colour and amount of soot on the base ring that counts and the position of the heat band on the ground strap.
The rest is down to flame spread pattern in the combustion chamber.
 
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