Re: 4000 Onan running rich
There is an adjustment screw on the carb for altitude changes. Make sure that is set correctly. Had a problem with mine a while back. Jim
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Jim Wahl....NHRA #2239 S/SS - IHRA # 8 Stock, D2 Stock Champion (forever I guess)
2019 Baby Gators Stock Champion
2009 NHRA D2 National Open Stock Champion
1982 NHRA D2 West Palm Beach LDRS SS Runner Up
Past President, Southern Stock / Super Stock Association. 
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