Topic: Clean base ring

[eigenvector]

If you pulled the spark plug from one of your cylinders and saw that the metal was utterly clean - as in absolutely no indication of soot on the base ring or ground strap, what would you believe was going on?  The electrode and ceramic tip looked (too all appearances at least) normal - perhaps indications of gas on them.

I see that and immediately I think, "It's not firing"  Yet, that doesn't seem right - the bike doesn't act that way.  Sure it doesn't have power, but it idles just fine - no way it'd do that on 3 cylinders. (would it?)

This isn't a test question by the way, my #2 cylinder is displaying this characteristic.

[Flyin900]

Does look too clean. Try switching it up with another cylinder's plug that has a more normal looking tan colouring.

Usually a non firing plug is going to cause enough of an issue that you would definately notice it only running on three cylinders, or at least misfiring.

How many miles have you put on the bike to check this condition? You would want the run 50-100 miles after any changes in parts to check the plugs condition. Just around the block isn't going to do it.

[scottly]

Sure it doesn't have power, but it idles just fine - no way it'd do that on 3 cylinders. (would it?)

Maybe you have never experienced a properly running CB? Indications of gas with no soot would point to a lack of, or weak spark.

[flybox1]

Just a tad on the lean side, but still withing a decent range.

[fitzmotor]

It would be fuel soaked if no fire, it's lean and must not run much with the choke on.

You could do a high speed run and shut it off at WOT, then read the plug,......... I hate that advise, too difficult to do that and read a plug, if it runs ok, that should be all that matters, but if you beat on it hard, make sure it's not too lean.

my 2 cents, only worth a penny.

[scottly]

Plug looks wet to me, but it could also be a major fuel blockage in the #2 carb. Either way, there is no fire occurring in that cylinder. I would check the spark first, just because it's easier.

[eigenvector]

Well I won't panic about it at any rate.  It just flat out looks too clean for my taste, although it may just not have enough miles on it to show the normal soot - because it's too lean.

But you're right, I'll take a real hard look at the firing - saw a good clean spark from it, but possibly it's not consistent or it's cutting out with heat.

Alright, I have a plan of action.  This is a good time for this since I have the tank off for a bit of rust removal anyway and the weather is finally clearing up here.

Thanks all.

[ekpent]

Compare the heat with a wet rag on the head pipes after running to get  quick idea if its firing correctly, sizzle test.