Silly Me, I forgot the most basic simple try first grrrrrrrrrrrrr.
Ifffffffff your Onan carb has this (mine all did) at the bottom center of the carb is a mixture adjustment (how rich or lean) perhaps also called an "Altitude Adjustment"
Turning it out RICHENS the gas/air ratio (needed if its surging and not black smoking) while turning it in LEANS the gas/air ratio (needed if its black smoking) IT OFTEN JUST TAKES 1/8 TO 1/4 TURN TO FIX A PROBLEM DONT GET TOO EXCITED.
Have it running preferably under a load n try turning that screw first out then in a bit n see if she smoothes out n runs n stops surging or black smoking????????????????
NOTE Ive had some when I had to remove the plastic stop turn preventer then I got enough adjustment out of the screw for the correct mixture BUT NEITHER ONAN OR ME RECOMMEND THAT LOL
I hope Billy can correct me and/or add to this if Im all wet, it wont be the first time and he wont get any cherry lol
John T TRY THIS FIRST IF IT HAS THE BOTTOM OF CARB ADJUSTMENT SCREW and Billy says its ok
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Today's Featured Article - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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