RDJ7Y Champion
The owners manual states that the proper plug gap is .020"
Rdz19h
Wut a mess trying to replace this plug!! Prob gotta order it, but part # 753-06193.
FROM THE OWNERS MANUAL: REPLACING THE SPARK PLUG Use a Champion RDJ7Y spark plug, or equivalent. The correct air gap is 0.020 inch (0.5 ram). Remove the plug after every 25 hours of operation and check its condition. 1. Stop the engine and allow it to cool. Grasp the plug wire firmly and pull it from the spark plug. 2. Clean around the spark plug. Remove the spark plug from the cylinder head by turning a 5/8-inch socket counterclockwise. 3_ Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.020 in. (0.5 ram} using a feeler gauge. You can get the manual at: http://www.managemylife.com/mmh/lis_pdf/OWNM/L0601244.pdf
Champion CJ8 spark plug is for the crsftsman 3.0 edger/trimmer
spark plug is good but when its plug in to coil on spark
0.020"
I just looked that up for mine. I found this chart: http://www.psep.biz/store/ryobi_trimmer_spark_plugs.htm it depends on which trimmer you have
I think it is 0.030".
Mine is 3/4
anywhere between 16 and 18 on a spark plug gauge should work fine.
0.020 in or 0.50mm