Discussion:
GP25KH Issues

This one is very frustrating. GP25KH gasoline only. Installed new engine due to low compression. Bought through a cat dealer. Ser#AT17B95880. Set timing at 4 degrees btdc. Had carb rebuilt. Machine is hard starting, you have to pump it several times to get it started. It idles erratically, not smooth. Carb idle air mixture screw about a turn and a quarter out. It runs horrible. Very slow idling up when you hit throttle. Backfires randomly through exhaust and air filter/ carb. Backfired once after it was shut off. I'm at a complete loss on this one. Any help is greatly appreciated.
  • Posted 4 Feb 2016 09:00
  • By semocoachworks
  • joined 18 Apr'14 - 8 messages
  • South Dakota, United States
Showing items 1 - 1 of 1 results.
Backfires randomly through the carb and exhaust seems like a distributor problem. Are you sure it is firing at 4 degrees btdc? Maybe the valve clearance wasn't set properly? Can you see the accelerator pump squirt fuel, if you look in the carb, when you throttle it? Is it a new or rebuilt motor? Maybe the timing belt is on wrong.
  • Posted 4 Feb 2016 22:22
  • By mrfixit
  • joined 11 Dec'08 - 1,434 messages
  • New York, United States

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