Soot from exhaust

I have the same setup on my Europa also and had the same issue. It was caused by spending too much time with the choke on. When I start up now I get off the choke as quickly as possible and the spatter has disappeared.

Thank you,

but I can hardly keep the choke on shorter than I do. I guess it's on for maybe 20 sec. after start.

John

John

count from the top of needle down, as shown in the maintenance manual heavy. 

You might consider this may be related to prop loading.  Too much load, high pitch, can lug the engine and the balance of fuel to RPM can be out of balance.  The CV carburetor is adjusted to give you the leanest burn at about 75% power or about 5000 RPM.  

Cheers

My circlip is installed in grove no 3. That means 2nd reach. That is what I can see is recommended when I fly from ASL and up to 6000 ft.

However what I find strange is that the fixation screw (#5) on the drawing do not touch the O-ring but allows the needle with the circlip to move slightly up and down. This could give an imprecise position of the needle. Maybe it's within the tolerances, but I can't see what the O-ring is there for, if not keeping the needle in place.

“The temperature for Cylinder Head and oil are very low during flight, only around 70 degree C.” Yes, this could be contributing to your sooty exhaust. You’ve probably noticed condensation at your oil tank when you remove the cap as well? Are you reaching an oil temperature of at least 100c/212f each flight?