When I first started flying my RV-12 I was using 100LL with decal in, mostly as I flew home from buying the SLSA at Vans.
The inner exhaust pipe was a brownish great with a line of white around the pipe ring which I took to be lead from the fuel.
Since then I use 93 non-ethanol mogas almost exclusively (only 3 gallons 100LL since Jan 1st this year) for the last 35+ hours and the pipe is a brownish smudge on the finger.
I've just installed new floats, had carbs rebalanced, and new carb springs installed. Engine is running very well. I think moving the carbs dealing with the floats took them a little out of balance, not much but a little.
Today the inside exhaust has more of a black sooty smudge on the finger.
So?.question is?what are you folks experiencing and is the blacker sooty smudge indicative of anything?
I ran it by my Rotax mechanic and he said when we pull the plugs at annual in July if they look okay (brownish color) then he's okay with them and not bothered so much by the exhaust color.
Appreciate any input.
The inner exhaust pipe was a brownish great with a line of white around the pipe ring which I took to be lead from the fuel.
Since then I use 93 non-ethanol mogas almost exclusively (only 3 gallons 100LL since Jan 1st this year) for the last 35+ hours and the pipe is a brownish smudge on the finger.
I've just installed new floats, had carbs rebalanced, and new carb springs installed. Engine is running very well. I think moving the carbs dealing with the floats took them a little out of balance, not much but a little.
Today the inside exhaust has more of a black sooty smudge on the finger.
So?.question is?what are you folks experiencing and is the blacker sooty smudge indicative of anything?
I ran it by my Rotax mechanic and he said when we pull the plugs at annual in July if they look okay (brownish color) then he's okay with them and not bothered so much by the exhaust color.
Appreciate any input.