abbylind Posted February 4, 2015 Report Share Posted February 4, 2015 I have NGK plugs in my 77 LB20. I was getting RFI noise on both my goodtimes radio (AM FM) and my two way radio. Thought it was the spark plug wires so a bought a special set from Magnacore..still no joy. NGK isn't too clear which plugs are RFI resistant (Resistor plugs). I went though this same problem with my 74 620 4X4 but my old brain cells have left me and I don't remember which plugs solved the problem. For those who aren't familiar, this RFI noise comes from high ignition systems It sounds like bacon popping in frying pan on your radio as the engine RPM's rise it makes more noise sounding like a beehive. It is NOT generated from the alternator....that RFI sounds like a whine or whistle that rises and lowers with engine RPM Help old wise ones! 1 Quote Link to comment
abbylind Posted February 4, 2015 Author Report Share Posted February 4, 2015 In reading a little further it appears NGK doesn't offer a resistor spark plug. They offer resistor covers with a 1,5, or 10 ohm resistor. From what it looks like they snap in between the plug and wire..anyone familiar with these? Quote Link to comment
abbylind Posted February 4, 2015 Author Report Share Posted February 4, 2015 <table width="100% height=" 10"="" border="0" align="center" cellpadding="0" cellspacing="0" style="color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-size: medium;"> Home » Products » Performance Download Document:Resistor Cover Fit Guide (1MB PDF) Resistor Covers Power Sport Manufacturers are required to meet noise suppression standards throughout the world. Spark Plugs alone do not provide enough noise suppression therefore resistor covers were introduced. NGK Resistor Covers are designed to reduce “Electro Magnetic Interference” and “Radio Frequency Interference” which can interfere with electronic ignition components causing misfires and poor engine performance. NGK Resistor Covers are manufactured using extremely durable Phenolic Resin and EPDM Rubber. Ceramic resistors are used to ensure optimum performance and reliability. Resistor Covers must withstand extreme heat, vibration, prevent flash over and must be water proof. NGK Spark Plugs superior design ensures optimal service life and performance. Resistor Covers are for Motorcycle, Marine, Snowmobile and Small Engine applications only. Original Equipment fit, form and function Available in various shapes and sizes Designed to fit removable terminal nut and solid terminal nut spark plugs Designed for 10 mm,12 mm and 14 mm diameter spark plugs When you require Original Equipment fit, form and function demand the best NGK Resistor Caps Quote Link to comment
flatcat19 Posted February 4, 2015 Report Share Posted February 4, 2015 Searching allowed you to answer your own question. Kudos. Can we sticky this thread as proof? Quote Link to comment
abbylind Posted February 4, 2015 Author Report Share Posted February 4, 2015 Affirm...good one to have in the files sir 1 Quote Link to comment
Guest Rick-rat Posted February 4, 2015 Report Share Posted February 4, 2015 BPR6ES is a resistor plug the "R" in the number means resistor. This is the plug your truck should use, found in NGK website Just for your info abbylind, I am old but not considered wise, no one listens to me anyway so buy whatever you think will work :rofl: 1 Quote Link to comment
abbylind Posted February 4, 2015 Author Report Share Posted February 4, 2015 BPR6ES is a resistor plug the "R" in the number means resistor. This is the plug your truck should use, found in NGK website Just for your info abbylind, I am old but not considered wise, no one listens to me anyway so buy whatever you think will work :rofl: Hahaha gotcha! Sometimes I think they keep me around not for wisdom but ballast... Quote Link to comment
laotsu Posted February 4, 2015 Report Share Posted February 4, 2015 I'm curious what an LB20 is. Is that some sort of frankenmotor? 1 Quote Link to comment
DanielC Posted February 4, 2015 Report Share Posted February 4, 2015 Another way to reduce ignition noise is to shield the secondary wiring. But get the shielding too close to the plug wires, and it will rob spark energy. I did this years ago, when I spend a lot of time on freeways, with a CB radio. Quote Link to comment
Gradyfest Posted February 4, 2015 Report Share Posted February 4, 2015 I assume by "LB20," you mean L20B. This photo is from my 1980 720 service manual. It shares the same L20B as yours I assume. Quote Link to comment
Gradyfest Posted February 4, 2015 Report Share Posted February 4, 2015 (edited) Hope that helps! Edited February 4, 2015 by Gradyfest Quote Link to comment
abbylind Posted February 11, 2015 Author Report Share Posted February 11, 2015 Changed the plugs...still no joy. Rechecked the ignition wire connections..same I also ran a new ground from the (-) battery terminal to the body and ran a ground strap from the hood to the body...I guess I'm going to have to look at the heavy duty Magnecor wires... Quote Link to comment
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