Hi, was wondering if anyone here could help with an issue re a rich-running RV-4.
Airplane starts right off, idles fine, run-up is perfect. T/O proceeds alright, maybe power isn't 100% there, but good.
After about 1/2 hour, engine starts to run rough. Gets rougher over time. Able to smooth it out by leaning, but shouldn't have to at 2000'. Airplane has run perfectly smooth for years, but now something is not right. Head back to the field pronto. Back on the ground, plugs are completely blackened with soot - definitely showing over-rich mixture.
Recently changed out to new plugs, new harness, new mechanical fuel pump, and overhauled carb. I did open the carb and change the float to the blue epoxy model. Float level checked 10 times - seems to be perfect (on the ground).
Did I screw up the float installation? Is the overhauled carb the wrong model for an RV-4? But it's the same model I've used for years without any trouble (10-5009).
Out of ideas, getting nervous to fly it.
Thanks for any insight..
Airplane starts right off, idles fine, run-up is perfect. T/O proceeds alright, maybe power isn't 100% there, but good.
After about 1/2 hour, engine starts to run rough. Gets rougher over time. Able to smooth it out by leaning, but shouldn't have to at 2000'. Airplane has run perfectly smooth for years, but now something is not right. Head back to the field pronto. Back on the ground, plugs are completely blackened with soot - definitely showing over-rich mixture.
Recently changed out to new plugs, new harness, new mechanical fuel pump, and overhauled carb. I did open the carb and change the float to the blue epoxy model. Float level checked 10 times - seems to be perfect (on the ground).
Did I screw up the float installation? Is the overhauled carb the wrong model for an RV-4? But it's the same model I've used for years without any trouble (10-5009).
Out of ideas, getting nervous to fly it.
Thanks for any insight..