[NSRCA-discussion] OS 140Rx pump question

[Ed Alt]

John:
Do you have the fine or course needle in there?  With the fine tapered 
needle, you should be open about 2 , maybe up to 2 1/4 turns.  The course 
needle should be about 1 1/2 at most. You might be able to visually inspect 
the pump adjust screw to see if it was messed with.  They are factory sealed 
with some red goop and you might be able to tell if the seal was broken 
under that magnifing lense you have.  Not sure what the adjuster would feel 
like by turning it, I never tried it and wouldn't do that just yet.

What's the Aeroslave pipe length set to again?  Mine is 32 1/4" when 
measured in a straight line from the center of the plug to the end of the 
canister part of the pipe.  Mac header, not accounting for rise in this 
measurement.

Ed


>From: "John Pavlick" <jpavlick at idseng.com>
>Reply-To: NSRCA Mailing List <nsrca-discussion at lists.nsrca.org>
>To: "NSRCA Discussion" <nsrca-discussion at lists.nsrca.org>
>Subject: [NSRCA-discussion] OS 140Rx pump question
>Date: Sun, 24 Sep 2006 01:29:48 -0400
>
>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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