Review on 🔌 Champion Copper Plus Small Engine 940 Spark Plug - High-Performing Spark Plug for Optimal Small Engine Performance (Carton of 1) by Michael Norwood

I'm having trouble finding a Champion RDZ19H spark plug for my old Trimmer Ryobi 990r. Lowes had a non-Champion replacement that was listed in the cross reference manual as a replacement fork in my trimmer, but I bought it and found it wasn't compatible. I recommend you take out the spark plug and buy or order a spark plug that exactly matches the part number on your spark plug. Replacing the RDZ19H has greatly improved my trimmer's startup and performance. I'll probably order a spare to have on hand if my trimmer goes haywire again.