Forgive me if this sounds stupid, but i wouldnt expect to be able to turn it over by hand at all, even with the plugs removed wont there still be alot of pressure??
Def replace that spark plug though, even if it does work if the gap isnt good or the electrode is chipped or whatever then you wont be getting very good combustion.. i can see the horses leaking away already..
i had a pair of rather nackered plugs and i replaced them with the iridium ones from rsvr.net and the bike has been running so much nicer ever since :thumbup
did you mean the engine cut out after it made the strange noise or you just turned it off?
every now and then mine makes a strange clattering sound when i start it, i was very worried at first but after starting it again it was ok so i just treat her more gently until the sound is normal, probably sprag clutch or starter motor on its way out. might be something completely different on yours though.
you might find it was just because of the dodgy spark plug, certainly if only one plug was messed up you would get some rather funky things going on as one cylinder fired as usual and the other has poor ignition things would not be in the usual balance, which could lead to the cam chain being sloppy so like spoonz said, probably worth checking it out!
First thing i would do is give it a whole new set of spark plugs and see if that sorts it, then i would probably check the sprag clutch to see if its getting chewed to pieces, then its checking the cam chain and whatever else.
Hope its nothing too bad!
