I have an old JD 400 with 60" deck, I had a fuel line leak and just pushed it aside, now I would like to get it running. (it's been sitting for a year) Took seat and tank off, repaired fuel line, put it all back together. I have new fuel in tank and fuel at the carb. but the Kohler K532QS wouldn't start. Found a carburetor online (the ROP Shop) and installed it. It fires then dies. I have fuel, pulled the plugs and I have spark at both plugs. So, one plug is wet and black and one is not. I have checked the adjustment on main and idle jets, then set them per the JD400 service manual. Still fires the first time then dies. If I keep trying it might fire again then stops. Where do I start? I was told this motor is a repower, so how do I know if the tag on the side panel is correct? Any help with this machine would be greatly appreciated. Oh, air filter was not installed when I tried to start. I did have foam filter media covering the opening on the 90* intake. hey thanks again, I have no idea how many hours on this motor. Just retired, don't golf, garden is over, except my sprouts. I own to many old machines.