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Engine basics => Engine set up tips => Topic started by: David Ruff on April 26, 2015, 06:02:08 AM

Title: Needle Setting on Fox .35 Stunt using ST NVA
Post by: David Ruff on April 26, 2015, 06:02:08 AM

Installed the ST .51 NVA in a Fox .35 Stunt.  Just wondering how many turns open I should start with.

Thanks in advance.

Title: Re: Needle Setting on Fox .35 Stunt using ST NVA
Post by: frank mccune on April 26, 2015, 07:04:24 AM

    Hi Dave:

     Bring it to Hampden today after 14:00 for help or you may try 3-4 turns open and play it by ear.

                                                                                                                       Frank McCune

Title: Re: Needle Setting on Fox .35 Stunt using ST NVA
Post by: Robert Zambelli on April 26, 2015, 07:35:52 PM

Dave - I have tried that setup and had problems.
The ST spray bar is a larger diameter than the Fox and will restrict your intake.
Turn down the spray bar to .125 where it crosses the venturi.
Or, buy one from Randy Smith.

  Bob Z.

Title: Re: Needle Setting on Fox .35 Stunt using ST NVA
Post by: bruce finley on April 29, 2015, 10:59:40 AM

Quote from: Robert Zambelli on April 26, 2015, 07:35:52 PM

Dave - I have tried that setup and had problems.
The ST spray bar is a larger diameter than the Fox and will restrict your intake.
Turn down the spray bar to .125 where it crosses the venturi.
Or, buy one from Randy Smith.

  Bob Z.

could you drill the venturi instead?  and what size drill bit would that be?

Title: Re: Needle Setting on Fox .35 Stunt using ST NVA
Post by: bob whitney on April 29, 2015, 04:27:37 PM

if u drill the venturi all the way through u will change the crank timing and it wont run the same ,Randys needle assby works great
if u have a drill press u can chuck the spray bar up and file it down on the part that is actually in the venturi. go slow and suport it while u file