Just replaced my starter and now my engine barely cranks if even at all, take the spark plugs out and it cranks good put the plugs back in and barely cranks. I also replaced the gaskets on my rocker boxes but on the rear cylinder i had to Compress the rear valve spring a bit to get the lower rocker box off, is it possible that I bent the valve stem and not the engine is tying up? Also just replaced the battery. Any ideas please help