Dear NETRIDERS. Id like to post my 1st ever in life time cylinder head work. It come with spark plug at the first time. I wanted to replace a spark plug on front bank of my VTR 250. and see what happened on attached file. Seating in head for long long time and FXXKed. It came out without its THREAD. so I decided to take off cylinder head to drill and re-thread. sigh..