I have a 1997 Kubota G1900 garden tractor that cranks but dose not start. I have a brand new battery that is required. I have a fairly new starter and a brand new alternator. I even replaced the combination box for the safety switches. I have tested all the fuses and safety switches. I cracked the injector lines to see if there was fuel and there was. Not sure at this point was is preventing the engine from starting. It just seems that it is not cranking fast enough.