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General control line discussion => Open Forum => Topic started by: Paul Taylor on July 20, 2008, 06:29:39 PM

Title: Fox NVA question ---- 2 holes or 1???
Post by: Paul Taylor on July 20, 2008, 06:29:39 PM

I have a Fox 35 3 bolt back plate. I found an old NVA that fit this engine but it has two holes in the NVA.

Will this work. And do I turn the hole 90 degrees off. So they are pointing front and rear?

Thanks
Paul

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Leester on July 20, 2008, 07:16:06 PM

Paul, position the needle valve so when you look down the venturi you can't see either hole.

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Paul Taylor on July 20, 2008, 07:32:49 PM

Got it!
Thanks Leester

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Harleyman on July 20, 2008, 10:53:04 PM

Leester's right, you should set it so that you cannot see the holes.

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Paul Taylor on July 21, 2008, 08:57:49 AM

I will give it a test run today or tomrrow. y1

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Just One-eye on July 21, 2008, 10:59:39 AM

Quote from: Harleyman on July 20, 2008, 10:53:04 PM

Leester's right, you should set it so that you cannot see the holes.

There has often been variation in the amount of off-centeredness involved, but almost all are somewhat off of being exactly 180 degrees apart, so if there's no position at which both disappear from view, just get them to the place they both show the (equal) smallest bit of a hole still visible (this advice being second best to my next suggestion, which is to use one of Randy Smith's NVAs instead, although I seem to recall that Joe Just had some the right length, and smaller diameter, perhaps somewhat closer the the stock Fox size). 

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Peter Hess on July 21, 2008, 05:45:04 PM

Give yourself a treat and spring for one of Randy's PA NVAs for the Fox 35.  It is a vast improvement over the stock Fox NVAs and, in my humble opinion, is better than the ST.

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Brett Buck on July 21, 2008, 08:12:50 PM

Quote from: Just One-eye on July 21, 2008, 10:59:39 AM

There has often been variation in the amount of off-centeredness involved, but almost all are somewhat off of being exactly 180 degrees apart, so if there's no position at which both disappear from view, just get them to the place they both show the (equal) smallest bit of a hole still visible

  If it's offset put the "close" side down towards the crank, and  in any case, put it crossways as you can get it. It doesn't really matter - I have seen them with one hole straight up and the other straight down work just fine.

     If you get a good combination of needle and spraybar, the stock parts work pretty well, even when it leaks air like a sieve. But I can't tell you for sure how to find which are good combinations or bad combinations without just testing a bunch of them.

     Brett

Title: Re: Fox NVA question ---- 2 holes or 1???
Post by: Dave Rountree on July 22, 2008, 05:08:56 AM

also a short piece of fuel tubing slid on the needle itself sandwiched between the nut holding the spraybar and the notched disc on the needle will seal the air leak. just make sure the tubing is slightly compressed when you are near your correct needle setting. it helps. Dave R