jdross440 Posted March 11, 2021 #1 Posted March 11, 2021 Should I use non-resistor type or resistor type plugs? It calls for DP8EA-9, however these cross over to NGK 5829 which is non-resistor and also crosses to NGK 4929 which is resistor type. I have replaced the factory coil/plug wire system with a Coil Over Plug system. I seem to be getting a lot of ignition noise in my headset the last few days and it feels like it is missing on one cylinder intermittently lately when cruising at a constant speed (around 3000-3300 rpm).
Pro procrastinator Posted March 11, 2021 #2 Posted March 11, 2021 Have you pulled your plugs yet? I'm wondering what shape they are in. Has the noise been there since the conversion or has it built up? Might want to check your wires for wear or make sure they are not bundled up with any of the regular wiring harness. Having switched from stock you might have to see what the coil manufacturers recommended plugs would be.
saddlebum Posted March 11, 2021 #3 Posted March 11, 2021 I would assume in your case you probably have to resort to resister type plugs. With the OEM system the resister is built into the plug boot. With the COP system this may not be the case. If not sure there is no harm in trying Resister plugs. Worst case scenario you may have a weaker spark. But if it gets rid of your noise and you can't feel any difference in how the bike runs you laughing.
Pro procrastinator Posted March 13, 2021 #4 Posted March 13, 2021 Reading through the old service bulletins they did suggest resistor plugs to eliminate radio noise File that away in my "things ive forgotten recently" folder
jdross440 Posted March 15, 2021 Author #5 Posted March 15, 2021 Top plug in pic was dirtiest and came from RH rear cylinder. I pulled the cover off carb diaphram for that cylinder and it had a little oil in it. Enough to wet finger.
Pasta Burner Posted March 16, 2021 #6 Posted March 16, 2021 They look pretty crispy to me. I can’t recall off the top of my head if I pulled the plugs on mine when I got it.
jdross440 Posted March 16, 2021 Author #7 Posted March 16, 2021 The new plugs got rid of the ignition noise in my headset. I haven’t gotten to ride further than 5 miles yet. Prob tomorrow. I used ngk 4929 resistor plugs. Old plugs had about 20k miles on them.
saddlebum Posted March 16, 2021 #8 Posted March 16, 2021 by the look of those plugs I say your running pretty rich or with a pretty dirty air filter
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