I have a John Deere 317 that started to run weird during the summer. It had very low power and was acting like it wasn't getting enough fuel. at first i thought it was vapor locked so i cleaned the carb and got it fresh fuel. but that didn't help, because now it wont start at all. i can't see a spark at the plugs either now. i had pulled and cleaned the engine because the fins were very gummed up and being the kt17 s1 i wanted it to stay as cool as possible. i can't afford to re power it.before i pulled the engine it would never level out for lack of a better way to describe it. after pulling it, it took time to dry, and then it wouldn't start on starting fluid. then we pressurized the tank and it would run for a little while but then die, but when we took the fuel hose off the carb the pump was still pushing out fuel. i have run out of ideas to try. can anyone help? has anyone had this issue?