I have a 86 bounder with a 4 kw onan. The gen appears to be original by all the dirt and oil down on the cylinders but when I bought the MH the last owner said it was rebuilt and the hour meter only showed 90 hrs on it but the gen ran great up until about 6 months ago when it wouldn't start so I pulled the carb and found some small pieces of black rubber that was fuel line so I replaced the line and put it all back together I also replaced the fuel pump because the filter was missing. At some point someone had removed the filter. It would start but surged for a good 10-15 seconds before it would smooth out. Now when I start it all it does is surges and will not smooth out at all. I adjusted the carb by what the book said. I'm at a loss. Am i missing something?