Spark plug color - CO level adjustement

[errol]

I'm running a Yoshimura RS-5 under tunnel exhaust!

I have adjusted my CO level to +10 on all cylinder.

Today I decided to check my spark plug. PITA by the way!

The one on the left side (clutch side) was barely colored (almost white)
The center spark plug was a very light brown
The one on the right side was a nice light brown!

When you adjust the CO level, is cylinder 1 the one on the left side (clutch side) ???

Is this normal or should I adjust my CO level differently on each cylinder ???

I'm running CR10 spark plug!

Thanks!

 

[HYFLYR]

You should be running cr9e plugs and not cr10's.

Also, adjust cylinder one if its lean, or white in your case. Cylinder one is the clutch side, i would say add 5 points to that cylinder and see how she goes.

 

[flainx]

Just to let you know, when I put my under tunnel exhaust on, I messed around with the CO levels. No matter were I put them, the performance never seemed to change. It still ran like crap with the under tunnel exhaust. I put the Dynajet fuel controler on, used Ulmer racings program he sent me (Thanks again Allen) and it is like a whole new sled. It is way snappier on the bottom and mid range and seems to have more guts on the top end.

Just my $0.02

 

[errol]

Thanks HYFLYR!

I'll try that! At least, the spark plug on cylinder one (clutch side) is the easiest to get at!

According to some Dyno results, CR10 gives an extra 1 to 2 HP!

My sled is running fine with the Under tunnel Exhaust.

It is just the spark plug color that worries me!

Errol