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I bought a used craftman with a kohler pro hydraulic valves.its turning over really hard when I start it and was hoping the valves could be adjusted but I took the valve cover off and theres no adjustment.when I turned the motor over by hand there is no gap in the valves at all.can someone tell me whats going on.i have a new battery and briggs if this happens you adjust the valves.is my starter shot

post model number from under seat as well as all numbers from engine data plate.

this is on the engine 3khxs.49026b

It could have carbon build up on the heads and pistons.

that would give it too much compretion correct?

http://www.kohlerengines.com/onlinecatalog/pdf/24_690_07_EN.pdf see page 19, engine starts hard. Let us know what you find, start with easiest & move on to more difficult, thanks.