NewHoundAussie

I am using DA's Pitts muffler.

An update on "MY" situation.

I went back to last years method of tuning.

1.) Set Throttle delay to 20-25% ( approx. 1 second on 9CAP)
2.) Start engine --- warm up throughly.
3.) Lean out the low end until it will not throttle up (quits )
4.) Richen until the engine "just" transitions using small 1/16 changes (with throttle delay)
5.) Set top end ( my engine required a richer mixture than the manual stated )
6.) Set idle(s) ( I have a high and low setting using the idle down feature)
7.) I went to a 22X8 prop so I could taxi better and also to get the rpm up to hasten break-in.

The engine still did not idle well ( high @ 2500 - Low @ 2000 ) ... will usually quit at low setting after 30 - 45 seconds.

Engine will still exhibit "the problem" if let idle too long ( 60 seconds ) ... requires "clearing" by continued "rev up"
Believe it or not ... even at this lean setting the engine still seems to "load up".

At these settings, when I first start the engine, it will not run above 1/4 throttle without quitting until it is warmed up ( sometimes 2-3 minutes),

I was able to put 3 flights on the plane without it quitting during taxi or landing ... but the taxi is at least a fast walk pace.
I am finishing my 4th gallon of gas and I will put 2 more gallons thru it using the break-in oil before I proceed to synthetic.

Good luck to all !