ORIGINAL: Nossfer
OK here is an update,
Started the engine and unless i increase the throttle wile dipping the plane into a simulated dive, it stutters and dies. If i increase the throttle giving it a bit more pressure on the exhaust port it does better. All in all not very impressed at this point.
How does the exhaust port factor in?
You do have a vent line to the thank, not to a muffler right?
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You should try two things...
1. - Richen both needles about 1/4 turn and try flying to see if this makes a difference.
2. - Put a loop in the line to slightly lengthen them.
Normally we WANT the lines to be as short as possible... however during a downline air WILL enter into the clunk unless the clunk moves forward with the fuel... something that Tygon is not very good at, so the clunk tends to get uncovered a lot.
That produces air bubbles.
Normally air bubbles get sucked out the needles so quickly that when the plan is throttled back in a dive you barely notice them, but if the engine is too lean you end up with a deadstick.
A fuel line loop leaves more fuel in the line for the engine to use during downlines.
3. - Run the engine nose down while you hold the plane and check for problems.