22-06-19, 04:21 PM
Completely agree with the post above, I took on my Fazer a few years ago and decided to service it (not having much history with it) and number 3 plug sheared off in the head, turns out the previous owner never changed it (only the others) because it had rusted in there due to the drain being blocked, ended up having the head off and drilled out then helicoiled (£450 later,) a good piece of advice would be to take them out and put some antiseize on the plug threads (not too much towards the nut end of the thread) just to help prevent this possibility in the future, also make sure the drain hole is clear too!