The #4 spark plug quits firing after appx a tank of gas, install new spark plug & good to go for another maybe tank or 2. Plug looks good when removed, no oil, black suit nor nothing, slightly wet from unburned gas. Compression 110 on all four, replaced plug cap. Just wondering. wire or coil maybe??
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"83" Honda CB1100F spark plug
- Thread starter rphillips
- Start date
That or the carb is dumping fuel way to fast for some reason???
Maybe check voltage at the coil? 1-4 linked? If so and #1 is not fouling that suggests a plug wire on #4. If you can replace the wires on those coils you may as well try. Check plug cap resistance too. Sometimes the caps fail on the inside.
Excessive fuel will wash away the plugs colour. Does the exhaust smell of excessive fuel?
Sounds plug wire related as suggested. Or a coil that is failing.
If 1 - 4 are linked just swap the plug wires and see if the problem follows the plug wire to #1 or stays at #4. If it follows the wire that will show it's either coil or the plug lead/cap. If not then it's likely elsewhere. Just one step in the process of elimination.
Thank ya'll, The plug doesn't look wet enough to be fuel fouled, nor is there a rich burning odor when new plug is in there. Already replaced the resistor, in the plug cap, with copper packing so the cap is good, now with no resistance. Wires on this coil are replaceable, I've got one on the way, should be here in a couple of days. I was wondering if a coil could possibly be bad on one side, wouldn't think so, but # 1 plug hasn't given any trouble. Hopefully just the wire. Thanks