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Needle valves?

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Needle valves?

Post  Ivanhoe on Tue Jan 10, 2012 1:28 pm

Does anyone know where I might get replacement needles for these backplates?



A needle from a SureStart fits the black one, but doesn't work properly, engine runs rich, and any attempt to lean it out makes it cut. The red backplate has a smaller diameter thread, SureStart needle won't screw in (this engine hasn't been restored yet).

Any help would be much appreciated.

Wilf
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Re: Needle valves?

Post  nitroairplane on Tue Jan 10, 2012 1:31 pm

I have one of those.
I is finer thread you may use a killer bee or medallion needle valve.
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Re: Needle valves?

Post  microflitedude on Tue Jan 10, 2012 1:46 pm

You'll need a couple of these - http://coxengines.ca/product.php?productid=412&cat=6&page=1

For the black one - http://coxengines.ca/product.php?productid=410&cat=0&page=1

Maybe the red one too, not sure.
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Re: Needle valves?

Post  Ivanhoe on Tue Jan 10, 2012 3:04 pm

microflitedude wrote:You'll need a couple of these - http://coxengines.ca/product.php?productid=412&cat=6&page=1

For the black one - http://coxengines.ca/product.php?productid=410&cat=0&page=1

Maybe the red one too, not sure.

Where do those seals fit, over the spraybar at the needle end?
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Re: Needle valves?

Post  microflitedude on Tue Jan 10, 2012 3:05 pm

Ivanhoe wrote:
microflitedude wrote:You'll need a couple of these - http://coxengines.ca/product.php?productid=412&cat=6&page=1

For the black one - http://coxengines.ca/product.php?productid=410&cat=0&page=1

Maybe the red one too, not sure.

Where do those seals fit, over the spraybar at the needle end?

Yes. The tops of the spray bar,needle seat.
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Re: Needle valves?

Post  RknRusty on Wed Jan 11, 2012 8:50 pm

Some needles have a different taper than others, but the same threads. That applies to the black plate. The red "Postage Stamp" product engine plate has a 124 TPI fine thread like the Texas Timers NVs. Neither the stock KB or Medallion is a fine thread.

Click the needle valves button on the left to buy a fine thread one for the red backplate. They are $5 each at http://texastimers.com/

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Re: Needle valves?

Post  Ivanhoe on Thu Jan 12, 2012 4:30 am

RknRusty wrote:Some needles have a different taper than others, but the same threads. That applies to the black plate. The red "Postage Stamp" product engine plate has a 124 TPI fine thread like the Texas Timers NVs. Neither the stock KB or Medallion is a fine thread.

Click the needle valves button on the left to buy a fine thread one for the red backplate. They are $5 each at http://texastimers.com/

Thanks Rusty, I'll give them a try
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Re: Needle valves?

Post  Mike1484 on Sat Jan 14, 2012 9:28 pm

The needles are 128 threads per inch, not 124.

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Re: Needle valves?

Post  RknRusty on Sat Jan 14, 2012 10:17 pm

Mike1484 wrote: The needles are 128 threads per inch, not 124.

Mike1484
Oops,Yep, so they are. I've made that slip before. Hopefully there's no such thing since I go around saying that. Thanks for the correction.

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