[NSRCA-discussion] OS 140Rx pump question

[John Pavlick]

[NSRCA-discussion] OS 140Rx pump questionDean,
 I don't know if it ever ran right. I bought it used. I started it for the first time on Friday. It has a new ring and new bearings. It has the OS dual-plug head. "F" in the center, "8" in the rear. None of this work was done by myself, this is how I got it.The entire mixture curve is too rich. Idle, top-end, mid-range. In other words too much fuel pressure. I set the pipe way long just so that I could fly it. The idle adjustment is full clockwise and it still loads up eventually. It's just too fat everywhere. I'm going to pull it and see what the pump looks like. Is there any way to put it back to the original setup if I find out that somebody adjusted something? OS doesn't give any reference - I guess they don't want you to touch it.

John Pavlick
http://www.idseng.com
  

  -----Original Message-----
  From: Dean Pappas [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Dean Pappas
  Sent: Sunday, September 24, 2006 12:23 PM
  To: NSRCA Mailing List
  Subject: RE: [NSRCA-discussion] OS 140Rx pump question


  Hi John,
  Did it ever run properly, before? If the adjustment screw wasn't moved, then the first thing to do is disassemble and clean. A piece of crud in the right spot will kill the regulation. Has the engine been decompressed with additional head gaskets? That add richness in the midrange. If that doesn't help, then you are stuck with either lengthening the pipe or fixing the carb metering curve with a throttle to remote needle curve coupling in the radio. 
  Dean
    -----Original Message----- 
    From: nsrca-discussion-bounces at lists.nsrca.org on behalf of John Pavlick 
    Sent: Sun 9/24/2006 1:29 AM 
    To: NSRCA Discussion 
    Cc: 
    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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