Plug wire help

Try new spark plug caps. They unscrew off the end of the wires. With a voltage meter they should measure 5000 OHMs , anything higher or lower and you replace them. NGK plugs are about $5 each.

Your motorcycle has two spark plugs per cylinder. Both spark plugs share a similar coil. If one of the two spark plugs is burning a different color from the other on the same cylinder then you either have one bad plug or one bad cap/wire. The wire and cap are one piece on your model. So you can buy a wire assembly from Honda or try just putting an NGK cap on the end of your old wire. The cap on the wire should test at 5000 OHMs anything higher or lower and you replace the cap. Of course the cheapest option is to just try a new plug first. The resister can burn out in a plug causing the same issue.

Unscrew the plug boot from the wire and look at the tip of the wire if you see some blue or greenish corrosion cut off about a 1/4 inch of the wire and replace the boot on the wire Ihad that problem before on a 89 CB 750

Try the cheapest route first. Have you installed new spark plugs? Spark plug caps are notorious for going bad on this model. Unscrew the caps from the end of the wires and check them with an ohm meter. If they read higher or lower than 5000 ohms, replace the spark plug caps. You might also have a bad coil wire. Unfortunately, the coil and wire are sold together. You could spray some water on the right wire, when it is dark, to see if there is arcing or shorting on the wire. If so, replace the coil and wire. New Honda part if available, a good salvage part It might be just as old or as bad as the one you take off.), or Accel makes some good aftermarket coil sets with wires.

You said compression is good then i would say you may have a bad coil , unless one coil runs all cylinders, but could still be a coil,,next thing i would check would be the injector make sure it gets a pulse if it does then try switching injectors from that cylinder to another cylinder and see if the weak cylinder changes with the injector change, if it does then you have a bad injector,

have you checked the spark plug caps, if they read above or below 5000 ohms replace them. If they are good then the news is bad. You could have a bad cdi box but more likely with this model , you have bad pulsar pick ups, which unfortunately are part of the alternator assembly. These can be checked without removing the engine by taking readings from the plug going to the cdi box. ac generator disconnect the stator wires at their connections. X10omega
white-blue 77-95 ohms
green-white 387-473 ohms
orange-green 95-116 ohms
light blue-green 95-116 ohms
orange/red-green 81-99 ohms
light blue/red-green 81-99 ohms

advance pulsar

orange/white-green 185-225 ohms
light blue/white-green 185-225 ohms

The fuel filter is in the tank on the petcock and is self cleaning. I suspect you have bad spark plug caps on your bike the cap is part of the wire. If you remove the wire and take a reading with an ohm meter, the cap should read 5000 ohms . Anything above or below and you should replace the cap. This is probably causing the slight miss.

plug wires!? They go bad over time, but may still look ok from outside ... get an ohm meter and pull a wire and check ... more than 500 ohms per foot is no good..... Good high quality wires will be no more than 150 ohms per foot.

Well, if it was running prior to your replacing the plugs, then somewhere you went amiss. Check the firing order. If when you crank the engine over and it pops and backfires then you have a few plug wires mixed up. Other than that the other item to check would be the rotor button in side the cap. Is it lined up correctly or broken? Good luck.

Did you buy the copper core (Low Ohms) or the carbon core (High ohms). The higher ohms will give you a higher voltage spark, assuming your coil can deliver it.