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Old 10-27-2008, 12:14 PM
  #34  
OldCoot
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Default RE: CRRC 40cc kit

The only difference between the RDJ7J and the RDJ7Y is that the Y has a projected tip. You should not have had to alter the rubber boot.
Be careful with the projected tip plug as it puts the ground electrode extremely close to the top of the piston.
I checked the RDJ7Y when I was assembling the engine and the ground electrode is only about 1/2 mm from the piston top. Of course, this is OK as long as nothing hits. I decided to use the RDJ7J just to be safe.

http://www.sparkplugs.com/results_cross.asp?pid=rdj7j

http://www.sparkplugs.com/results_cross.asp?pid=rdj7y