spark plugs

I was replacing my spark plugs today and notice that in #3 the spark plug was just turning but felt tight. the plug is still in one piece. The other 3 plugs came out just fine, actually looked good too. when i looked down, i noticed a crack next to the plug :eek: So, i assumed that the...

I just purchased a 2007 GTX 155 with 118 hours on it. I test drove the Ski and have put roughly an one hour of time on it and it ran fine. I decided to replace the spark plugs since i had no idea if they had ever been replaced before and when I removed the plugs they had fresh oil on them. The...