Following on... I have not been able to maiden the plane yet due to high winds for the past 2 weeks or so.

However i have fitted the sengine to the plane with and 12x6 APC prop and thought i would run it in the yard today (2.4 GHz). The engine fired up immediately (less than 1sec on the starter). After 30seconds or so to allow the engine to warm up I remved the glow starter - the rpm dropped which if i understand correctly means that the low speed needle is too rich. I kept the engine running by increasing the rpm a little and then went to WOT and tach'ed the engine at around 9300rpm but while holding the tach the rpm started dropping to 8300rpm and then slowly cycled a little without me moving the needle. The engine would transition without spluttering although the transition was slow. The engine ran reliably and did not cut out at all for the full tank of fuel as I "ground handled" around the yard.

But the gradual fall in rpm happened a couple of other times. I leaned the HS needle a couple of clicks until the engine seemed to be running at a constant speed of 9500rpm and then shut off the engine. It seems to be ready to fly but I am a bit concerned about the variability in rpm at WOT. Is this just a function of breaking in the motor or should I make the adjustments to the low speed needle and check it again?