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Engine basics => Engine set up tips => Topic started by: Paul Taylor on May 15, 2012, 08:34:31 PM

Title: NVA Sloppy fit - What to do
Post by: Paul Taylor on May 15, 2012, 08:34:31 PM

I have a LA .46 that I had a ST NVA in that did not work out right. I would like to put a OS NVA back in this engine.
So I'm sure someone has done this before.

Was thinking I could put JB Weld around the holes in the case to fill the gap?
Or cut some gaskets?

What do ya think?

Title: Re: NVA Sloppy fit - What to do
Post by: Russell Shaffer on May 15, 2012, 08:39:26 PM

I have used nylon washers, basically the same as gaskets.  I don't think you could keep the JB Weld in the holes, and if it got into the engine it might be bad. 

Title: Re: NVA Sloppy fit - What to do
Post by: Martin Quartim on May 15, 2012, 08:59:44 PM

Get a PA NVA or Enya NVA Pro.  The spray bar diameter is probably a bit bigger then the ST one,  and they work much better then the ST NVA.

Enya also has special set of washers (P.N.  SP4WS or something like that)  that you can use to center the spray hole right in the center of the venturi for any engine.


Martin

Title: Re: NVA Sloppy fit - What to do
Post by: Martin Quartim on May 15, 2012, 09:05:43 PM

The P.N for the Washers is SPW4S

(https://cs206.xbit.jp/~w041133/store13/images/SPW4S_SQR.JPG)

Enya NVA Pro ( It has a Nylon bushing that makes it air tight)
(https://cs206.xbit.jp/~w041133/store13/images/S5020_SQR.JPG)

Randy Smith should have these parts.

Martin

Title: Re: NVA Sloppy fit - What to do
Post by: Paul Taylor on May 16, 2012, 10:34:15 AM

Thanks guys.
I think the NVA is ok. It's my cowl. It is not a split cowl and I can not tighten the collier nut. Hence I need a screw in needle like a OS.  HB~>

Washers may work.

Title: Re: NVA Sloppy fit - What to do
Post by: Geoff Goodworth on May 16, 2012, 07:22:00 PM

Steve Rothwell has these in Oz. Maybe Randy or Henry Nelson does something similar. Knob diameter is 20mm, length is 35mm, hex is to suit the Randy Smith style spraybar collet.

Title: Re: NVA Sloppy fit - What to do
Post by: Paul Taylor on May 17, 2012, 10:59:02 AM

That would do it !!!
Randy?