The manual for my '05 GTI with the 717 motor says to gap the spark plugs at .018". That is one small gap! What is the result of going with a larger gap than the manual suggests, like .020 to .024" out of the box? I have ran my Seadoo about 20 hours this year on the plugs, and it isn't starting as quickly as it did when the plugs were new. I just replaced the plugs and adjusted the gap to .018" again. So I'll see how it starts the next time out.