[NSRCA-discussion] OS 140Rx pump question

[Wayne Galligan]

John,

What pipe? What fuel? What prop are you using?
Lengthen your pipe till the midrange richness goes away.  My OS will do the
same thing.  The needle on mine is about 3/4 turn out also .  I would not
mess with the pump till you have tried lengthening the pipe.  This almost
always fixes that problem.  Less load(smaller prop) on the engine shorten
pipe, more load(larger prop)lengthen the pipe.

Wayne Galligan
----- Original Message ----- 
From: "John Pavlick" <jpavlick at idseng.com>
To: "NSRCA Discussion" <nsrca-discussion at lists.nsrca.org>
Sent: Sunday, September 24, 2006 12:29 AM
Subject: [NSRCA-discussion] OS 140Rx pump question


> I'm having some trouble with my OS 140Rx and it seems to me that maybe
> somebody played with the pump (I bought this motor used). Here's what's
> going on. The main needle wants to be at about 3/4 turns out. Not even a
> full turn. If I open it to 1 1/4 turns it's slobbering rich. The idle is
> rich even with the adjustment turned fully clockwise. It is flyable, but I
> know something isn't right. This motor also has a dual-plug OS head. I
have
> an "F" plug in the center and an "8" in the rear. The transition isn't
> great, especially at about 1/2 throttle. On the ground it will actually
load
> up sometimes. In the air it's not so bad but it doesn't sound right. If it
> had a Perry pump I'd back off the pressure and that would probably fix it.
> Like I said, I'm thinking someone played with the pump for whatever
reason.
> Is there any way to set it up as it was originally or do I have to send it
> back to the service center?
>
> John Pavlick
> http://www.idseng.com
>
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