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I'm not familiar with your exact regulator, but I can tell you that a faulty regulator can cause multiple symptoms, some more prevolent than others.

Also- a warm engine is more tolerant of fuel mixtures being overly lean/rich than a cold one. The older impco regulators had no provisions for cold fuel enrichment. If the electric "trim" device you speak of is malfunctioning, do yourself a favor & replace the entire regulator (with the fuel trim solnoid) attatched- you'll save alot of frustration in the long run.
  • Posted 22 Apr 2013 23:05
  • By bbforks
  • joined 1 Mar'12 - 1,437 messages
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
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Movers & Shakers
Jim Tompkins Jim Tompkins
Chairman of the board, Tompkins Solutions
Director of government affairs, Associated Equipment Distributors
National dealer development manager, Castle Equipment Company
Sales operations, Heli