one other thing to check is the stud that holds the flywheel on the crank shaft. The clutch bell also screws in to the stud. I have had some problems lately with mine trying to come off. I stripped an aftermarket flywheel out with it, and it did it the other day and killed my first gear spur. So I am going to get a little loctite to fix that. The only reason I bring it up is because the engine wont pull start right if the flywheel is loose.