RE: Fox 3.2 Help
Iâ€™m back for more help. I still cannot get my Fox 3.2 engine to idle below 4000 rpm. I found that the carb butterfly was binding and not closing completely, so I thought that was the problem with the idle not going below 3500 rpm. The bad news is that I broke the butterfly assembly while trying to fix the problem so I ordered a new carb nd gaskets from Fox Mfg. I installed the new carb and gaskets and went through the fuel lines and could not find an apparent problem. I reset the high and low needles to the 1 1/8 turns setting Chris from Fox recommended.
The good news is I can now shut down the engine with the throttle. The bad news is the engine now wonâ€™t idle below about 4000 rpm without dying. As I bring the throttle down near closed, the rpm gets unsteady and seems to gradually load up and die.
At one point I had a good transition and top end, but nothing I did would get the idle below 3700 rpm before the engine died. The mid range rpm also seemed high at around about 5500 rpm with a WOT peak at about 6300 rpm (with a 22 X 8 prop).
I changed out the spark plug â€“ no help. The engine is also hard to start, requires choking each time, and will only start with the throttle open more than half.
I canâ€™t find an air leak. My best guess is thereâ€™s a fuel flow problem, but I canâ€™t find the source. Iâ€™m out of ideas, so I will probably send the engine back to Fox and ask Chris to check it out.
I would appreciate any ideas or recommendations you might offer.