pulling the plug element in a 21

[RodneyPierce]

First time in a long time that I had my boat out.. the NR 5port with a lower volume head, I think .17cc (Rodney?)

Yes sir. .17cc volume.

 

[jefffro007]

I tested this a bit yesterday.. I was looking at my old plugs that are still good. And I found that many of them has the coil bunched up at the outer edge, and to one side, of the plug. I pulled the coil out on one and ran a few tanks. Ran well,... pulled to plug to look and found that while running it had pulled that plug out even further!!! next run,.. the coil was gone!,.. no damage that I can see to the motor,.. but it was a well used plug. First time in a long time that I had my boat out.. the NR 5port with a lower volume head, I think .17cc (Rodney?) and the Spipe at 7 7/8, and 65% Otto Fuel, is a very nice combination. No problem getting on and off the pipe,.. nice speed,.. big Fun!

You might try a new plug thats never been heat cycled before you pull your coils.