[NSRCA-discussion] OS 140Rx pump question

[Dean Pappas]

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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