Craftsman 16 ohp kohler engine only firing a little bit but won't start?

16 ohp kohler engine got very little spark at the spark plug an will not start. I took the coil off an sanded it an the flywheel. I got a brand new battery an it turns the motor over just fine but spark plug is just not firing like its supposed to an I can't figure it out. Any help would be Appreciated! Thanks in advance!