Ditto above plug removal. I'd also suggest popping the valve cover for visual inspection- perhaps an adjuster got loose and tightened up valve clearances. Other thoughts:
With valve cover off, take out the cam chain tensioner. Easy to do, easy to cross off your list of suspects.
KACR issue- I've had the spring missing in a project bike, and although it will make kicking harder it will not make it a chore. But again, one of those things you can cross off.
Definitely would not force start it, that could cause serious damage at this point. Dig under the covers, see what you can see.
newcastleadam screwed with this post 02-24-2013 at 08:07 AM