No, one has a j at the end and the other has a y.
Champion - RDJ7JNGK RDJ7J
RDJ7Y Champion
E3.16 or champion RDJ7J
Champion RDJ7Y is the correct number.
This part number is for a Champion RDJ7Y spark plug. Set gap at 0.025" I bought a replacement plug, DJ7Y, at Home Depot on 10/6/13 for $2.38 + tax. The DJ7Y replaces the RDJ7Y. This plug is used for other tools such as my Ryobi trimmer and McCulloch chain saw.
I am using a Champion 872 RDJ7Y to replace the Jenn Feng 9111-310002 that was OE in my chain saw and it works fine.
Two compatible spark plugs for a Troybilt weed whacker that currently has a spark plug with a model number of 794 00055 is the Champion E3.16 or the Champion Spark plug RDJ7J. Both of these spark plugs will give your weed whacker the starting power needed in a replacement. You can buy them here http://www.mymowerparts.com/partdetail/1060/1042/10783.php
it uses a RDJ7Y
it uses a RDJ7Y
According to Champion, the correct gap varies depending upon the application. Most applications show an OEM gap of .025" but a few had an OEM gap of .030". I would set it slightly on the wide side of .025", and it will be good enough.
The Champion RDJ7J spark plug can be replaced by several equivalent models, with the most common replacement being the NGK CR7HSA. Other suitable alternatives include the Denso U24ESR-N and Autolite 3923. When selecting a replacement, it's important to ensure compatibility with your engine's specifications. Always consult your vehicle's manual or a professional to confirm the best fit.
the R stands for Resistor. It is a resistor plug.