Hi all, I was riding home last night after 10 hours in the saddle when I lost power and a loud noise started coming from the right side of the motor. I pulled over and checked the bike over. Nothing noticeable, no change in temperature, oil looked fine, cylinder heads not leaking. Tried to start and it would idle. I managed to get the bike home just putting along. On inspection this morning, No.2 spark plug was completely removed and had the ground electrode pushed against the centre electrode. No oil or burning on the plug. The tread looked to be OK so I assumed I must not have tightened it enough during service and it somehow worked its way loose. I tried to put it back in only to find it will not screw in. I am assuming the plug was forced out through pressure though there was no obvious signs. I can't image it vibrating loose but this may be the case. If so, I assume I will need to re-thread the seat to put in a new plug. Any help or advice would be greatly appreciated.