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What carb. inlet needle is best.

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Carl Tosh

Joined: 20 Dec 2008
Posts: 12
Location: Douglass,Kansas

Posted: Wed Sep 23, 2009 1:20 pm Post subject: What carb. inlet needle is best.

Hi Gang, I am getting ready to replace the old Ultrastar mikuni needle and seat. What works best with the fuel pump, the plain needle or viton tip? It has the plain now just want to see what you all think and why.

                                                               Carl

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mongsterone

Dana

Joined: 13 Dec 2007
Posts: 1047
Location: Connecticut, USA

Posted: Thu Sep 24, 2009 5:22 pm Post subject: What carb. inlet needle is best.

At 05:20 PM 9/23/2009, Carl Tosh wrote:

 	  Quote: 	
		  



Hi Gang, I am getting ready to replace the old Ultrastar mikuni needle and 

seat. What works best with the fuel pump, the plain needle or viton tip? 

It has the plain now just want to see what you all think and why.


	


Both will work the same, as long as they're the same size.  The Viton 

needle is supposed to last longer in a high vibration environment (which 

our planes definitely are, compared to the rigidly mounted engine in a 

snowmobile).



What you do need to make sure of is that you get a 1.5mm needle which is 

used with a pump.  Gravity feed installations use a larger needle.



-Dana

--

  Aviation is like drugs:  You go up, then you come down.  You are out a 

big pile of money and have nothing to show for it but the experience.

And you can't wait to do it again.

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dalewhelan

Joined: 11 Nov 2008
Posts: 105
Location: USA ARIZONA fountain hills

Posted: Fri Sep 25, 2009 8:01 pm Post subject: Re: What carb. inlet needle is best.

I think Dana is referring to the needle seat.

The number usually denotes the inlet diameter in millimeters.

It is how Mikuni works, I am a little new to Bings.

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Dale Whelan
503 powered Firestar II, Luscombe 8A
Projection, A simple and interesting Psychological concept

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