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  #1  
Old 17th August 2018
sltm1 sltm1 is offline
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Default Spark Plugs

Changed them 100 miles ago after a carb rebuild, left is front and right is rear....good to go for fuel mixture?
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Old 18th August 2018
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Quote:
Originally Posted by sltm1 View Post
Changed them 100 miles ago after a carb rebuild, left is front and right is rear....good to go for fuel mixture?
One on the left looks too white, even allowing for photos/monitors showing different colors, looks to have flakey deposits on the electrode. I wouldn't be happy with that.

Angle of electrode just doesn't look right for 25 thou gap to me. What's the spec?

This was a ignition kill/plug chop under load? Or just took them out at some random point?

Plugs can change color entirely in a few seconds. Idle won't tell you much - except about idle, of course - and "sooty" at idle will burn off quickly under "real" usage, or "too lean" at idle can be completely different once you get off idle onto a jet.

But if this were a 2:1 manifold, think I'd be be checking for a leak on the front.
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Old 18th August 2018
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Seems maybe like the front plug is a little too lean. Possible intake leak? Does it sneeze in the carb or anything?
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Old 18th August 2018
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Spec's are 40ths, not 25 according to service manual and the pic is a little bleached, there's more tan color than it shows, nothing through the carb and leaks were dealt with with new manifold "o" rings and carb gasket. I just inserted lollipops as you recommended and have about 5 miles on the bike since they were installed, they really changed the way the bike feels....I like it !
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Old 18th August 2018
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as long as the bike is running and performing well and no weirdness with spitting/sneezing into the carb, then i think you'll be fine. i'm glad to hear the lollies worked out! how did you set them, ~45º inside the pipe? you did set the mixture (and the idle) on a hot engine, right?
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Old 18th August 2018
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DooDah, I didn't reset the idle mixture after inserting them, I put them in at 90 degrees, from reading I understood that to be the starting point before re-tuning to what's best for your bike(?), figured I'd play with them from that point, but I am totally happy with the difference I feel now. They are 1 1/3rd inches across with a 1/2 inch hole in the center and centered in the muffler shell, (not the pipe) is 2 1/2 inches across and I have no dyno to check what I've done, but the bike almost feels like it has a heart beat (poetic exaggeration)

Spuggy, a random check engine cold after the above change and there is no flak or residue on either plug besides the even black on the second plug and it's two separate pipes.

Last edited by sltm1; 18th August 2018 at 03:24..
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Old 18th August 2018
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i have mine at about 45º in the pipe. i didn't necessarily mean you need to re-set the mixture after the lollipops, just speaking generally that a carb should always be tuned with the engine at operating temperature - not after a quick jaunt around the neighborhood, but a good long ride to really heat up all that iron. with my carb (mikuni), when i start it from cold, i have to up the idle speed a bit until it gets good and warm. then after a while when it's good and hot i'll have to drop the idle some to get back to that 900-1000rpm idle - as an example of how heat affects the carb tuning.
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Old 18th August 2018
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Got it DD, my carb's the same way, I like fussing with it so I'll do it while hot, not just running
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Old 18th August 2018
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There is a good chance the front plug will always display a lighter colour than the rear on these irons due to the front head running a little leaner than the rear. (No manifold leak necessary).
......Davi.
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Old 19th August 2018
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I thought it was because it runs a bit cooler since it gets full air flow for cooling
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