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I noticed on my 80 XS1100SG that my stock plug caps were 10k ohm and when I replaced cylinders 1 and 4 with new NGK 5K ohm caps the 1 and 4 plugs were more sootie and ran richer, didnt seem to fire as well as before. Seems like less resistance would make them run hotter not colder. Seems weird to me.
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Your intuition is correct. 5 ohm would not make sootier plugs.Skids (Sid Hansen)
Down to one 1978 E. Stock air box with K&N filter, 81H pipes and carbs, 8500 feet elevation. -
The heat of the plug is only how long the plug stays hot. It does not change the spark. A hotter plug would be for colder short runs only. A colder plug for long runs. The plug designed for the bike is in the middle. there are a couple racing tricks for plugs, but as to whether they really do anythin g on the bike is still up in the air i think.1980 XS1100LG Midnight
1991 Honda CBR1000F Hurricane
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Plugs 1 and 4 sootie
Plugs 1 and 4 are still sootie. Could I have a weak coil causing the problem. All 4 pilot jets are the same 1.5 turns out. cylinders 2 and 3 are a nice tan color.Comment
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Well not all cylinders require the same number of turns out.
Could always swap coils and see if the problem moves with the could or stays put.Nathan
KD9ARL
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1978 XS1100E
K&N Filter
#45 pilot Jet, #137.5 Main Jet
OEM Exhaust
ATK Fork Brace
LED Dash lights
Ammeter, Oil Pressure, Oil Temp, and Volt Meters
Green Monster Coils
SS Brake Lines
Vision 550 Auto Tensioner
In any moment of decision the best thing you can do is the right thing, the next best thing is the wrong thing, and the worst thing you can do is nothing.
Theodore RooseveltComment
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1 and 4 are fired by one coil and 2-3 by the other, so yeah, maybe a bad coil or related wiring, Swap coils and see if the soot issue transfers to the 2-3 plugs.'78 E "Stormbringer"
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