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Spark Plug Caps?

Piper J3

Well Known Member
I was having noise in the SL40 comm radio on my RV-12. After a lot of troubleshooting I decided to replace the spark plug caps. I had a suspicion that the 5-ohm ceramic resistor may have been damaged from pulling (manhandling) the rubber caps when removing the plug wires. The rubber cap is easily deformed.

I purchased new NGK Spark Plug Resistor Cover – 90 deg Elbow Type LB05F on eBay for $49.68 for qty (8). These caps are rigid phenolic and should prevent future damage to the internal 5- ohm resistor. Installation is very simple – just unscrew old cap from wire end and screw on new cap.

Radio noise problem is now fixed…

 
Last edited:
That is an awesome tip!
Thank you for posting.

Any chance you could post a link to the caps you purchased? . . :)
 
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