We have the same problem with two Archers and a 180.
The problem existed before and after overhaul of both 0-360 engines [1 by
Lycoming & 1 by Signature]
Both rebuilds had overhauled carbs fitted.
The other Archer with 2100 SMOH has the same stumble at or near 1500 RPM.
A clever guy on the net will soon enlighten us as to the cause I am sure ??

--
Roy
N5804F Piper Archer

"I have had some bad landings but I have never missed the runway"


"Dave Butler" wrote in message
news:1133797784.923574@sj-nntpcache-3...
Dave wrote:
Hi All! OK, since the collective talent in this group greatly exceeds
mine and those around me...

Today the engine in our 151 (O 320-150hp)Warrior stumbled
during power reduction, and we were able to repeat the symptom.....

I'm a little hesitant to reply since I can't supply details or references,
but what the heck, this is usenet.

I've owned an Archer (carbureted O360) and have heard of other Cherokees
with this same symptom. I was told there is a transition in the carburetor
at about 1500 RPM, and that many of these engines will stumble across this
transtion. Maybe it's a transition from the idle jets to the main jets(?),
I don't know what I'm talking about.

Anyway, I spent a lot of time and money trying to diagnose this symptom in
the Archer. Two owners later, the airplane is still around at my home
airport, and I'm told it still has the stumble. It gets you when you're on
short final and reduced power, and decide you need a little more power to
get to the runway.

Dave