Re: O.S. .46AX Tuning

From: Tim Wescott <tim@xxxxxxxxxxxxxxxx>
Date: Tue, 30 Aug 2005 16:36:24 -0700

Patrick Johnson wrote:

I recently purchased a slightly used O.S. .46AX.  I installed it inverted in
a Seagull PC-9.  The centerline of the fuel tank is approximately level with
the carburetor.  I also installed a Great Planes quick refueling jack in the
feedline.  The jack is approximately 3/4" above the centerline of the
tank/carburetor.

The engine cranks very easily and has a low and steady idle.  However, I am
running in to problems when attempting to adjust the needle valve according
to the owner's manual.  I am finding that the engine reaches maximum RPM
with the needle valve within a few degress of fully closed (clockwise)!
Otherwise it stumbles and hesitates when the throttle is opened fully.  It
revs fairly smoothly after adjusting the mixture control valve slightly
clockwise from the factory setting.

Is there something I am doing wrong here?  I have used other O.S. motors in
the past and was able to tune them according to the owner's manual.

Thanks!

It sounds like the needle valve is faulty or dirty. It'll probably run OK the way it is, but you may want to try cleaning it, or just getting a new one.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
.

References:
- O.S. .46AX Tuning
  - From: Patrick Johnson

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