David Ames

I am trying the needles at the fourth notch from the top. (it seemed like the easiest and least intrusive step) I have only done one static test run. I ran the engine for ~ 15 minutes at various throttle setting (sometimes at 5600, the prop wash was impressive!). I slowed the engine down taking ~15-20 seconds and shut it down. After I let the engine cool I checked the top 4 spark plugs. Front plugs were sooty. Back ones slight color to white. Before changing the needle all the plug insulators were white. I will be doing flight tests when the weather gets better.

Floats were weighed. Bowl level is ~10 mm from the top. Needle diaphragm and cuffs replaced. I am thinking it is running on the lean side.

Pressure is ~5psi. Fuel flow at the carbs with the electric fuel pump is >50 liters/hr. Only have one fuel filter between the tank and electric fuel pump. The symptoms are not consistent. Though more recently.

The vent tube to the airbox are free flow and positively attached. Not sure about the rubber caps. I do not see any on the Bing 64. Not sure how to answer the history question. The engine went "on condition" last November so the plugs fuel pump and rubber parts were replaced.

I have a Savannah with a Rotax 912. It has been running rough after take off. I tried using a little choke and that smoothed it out. Checking the plugs they are all consistently white insulators. The needle is the third from the top. The main jet is a 155. The float level is ~10 mm from the top of the bowl. Any ideas?

I am the next owner of a 2004 Savannah Classic. It has a XCOM which works reasonably well. I am having trouble with reception sound quality. Is it a squelch value issue or another parameter? (the manual download does not match up with the menu) Help? David