I pull mine every 5,000 miles or 6 months .. usually it's 5K comes first, but sitting a lot over time can even be worse than riding daily for a year than sitting a lot in 6 months time.. Can't say enough about never sieze but will mention it again .. also don't overtorque when tightening ..

 

I appreciate everyone's feedback. It did look like the top few threads were messed up, and the new one (with anti-seize) tightened up to spec. i'm gonna chase it with a tap

 

The plug threads are most definitely SHOT. None of my business, but I'd be pulling the head in the coming weeks for a repair. My F150's heads only had 4 threads in the plug holes. When I had them surfaced I also had them install full length hard anodized Al. inserts.

 

I pull mine every 5,000 miles, just before I replace them. Always anti-seize compound.

 

I'd think that if you had the option, the high-temp nickel anti-seize would be far better than copper. That's what I always use anyway. This may be even more important on an air cooled cylinder.

 

Always sue anti seize and there is no need to over tighten spark plugs.

Drew

 

Same here...think I'll pull mine and re-apply anti-sieze this week.

 

running a tap through the hole will put shavings in your cylinder, even if you try to vacuum them out, there is no guarantee you will get them all out. I would pull the head.

 

you already seated another plug, Id also skip re-tapping for the same reason stated above. Did you pull the plugs when the engine was hot? How are you torquing your plugs?

 

I could not agree more. anti-seize is a must have for anybody who works on their own ride. There are many different types too, nickel, copper, etc. It not only prevents galling, it also works as a heat sink to help conduct heat away from the plug and into the cylinder head. I use the highest grade stuff I can find, and a can will last for years. While we're on the subject of spark plugs, I highly recommend silicone dielectric grease inside the spark plug wire ends. It keeps water out, and makes it easy to remove them after lots of miles. I use it on electrical connections, bulb sockets, etc. and it works great. a tube of that will last years too! Good luck with repairing the threads, you might try and find someone with a borescope and inspect the threads. if they are not missing, you may be able to grease a thread chaser and clean up the hole...