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CLARK GCP25 ENGINE PROBLEM

I HAVE A 1995 CLARK CGP25 WITH A 4 CYL MITSUBUSHI PROPANE ENGINE WITH A PROBLEM WE CAN NOT FIGURE OUT.WHEN FIRST STARTED ALL IS FINE BUT WITHIN MINUTES OF RUNNING AT HIGHER RPM UNIT BEGINS TO RUN ROUGH AND RPM'S SLOWLY DROP TO THE POINT WHERE IT STALLS.IF HELD TO THE FLOOR WE GET SOME BACKFIRING THROUGH INTAKE BEFORE IT STALLS.IF WE LET IT SIT FOR A MINUTE UNIT WILL START AGAIN BUT SEEMS TO HAVE NO COMPRESSION WHEN YOU FIRST CRANK AND THEN STARTS AFTER 10-15 SECONDS OF CRANKING.IGNITION SYSTEM ALL CHECKS OUT FINE.ANY IDEAS
  • Posted 26 Nov 2011 05:19
  • By TPRIMEAU
  • joined 26 Nov'11 - 2 messages
  • Ontario, Canada
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BASED ON WHAT I HAVE READ THIS IS WHAT WE HAVE SUSPECTED BUT JUST WANTED TO HEAR IT FROM OTHERS BEFORE WE DO A TEAR DOWN.REALLY APPRECIATE YOUR TIME.THANKS
  • Posted 26 Nov 2011 07:21
  • By TPRIMEAU
  • joined 26 Nov'11 - 2 messages
  • Ontario, Canada
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Ive had this a few times with these engines, it will be the valves sticking in the cylinder head, engine runs fine untill its worked hard and gets hot then it drops off a cylinder as the valves start to stick and do not seat propperly.

It will need the cylinder head off to clean the valves and guides up unfortunatly.
  • Posted 26 Nov 2011 06:43
  • By andrew_k
  • joined 17 Mar'07 - 325 messages
  • England, United Kingdom
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