Well, I got 10,000 miles on my '06 so I decided it was a good time to change the spark plugs. I never had the air box off so I went slow--unhook this, uplug that, etc. Old plugs came out easy and really didn't look too bad. Got everything hooked back up and started the bike. WOW--what a difference!!! While I couldn't take her out on the road (too cold, ice, snow) the idle in the garage was smooth and nice! Easier job than I thought! Guess I won't wait so long next time!