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Engine basics => Engine set up tips => Topic started by: jeffindayton on July 11, 2006, 07:26:48 PM

Title: OS LA25 needle valve options?
Post by: jeffindayton on July 11, 2006, 07:26:48 PM

I would like to know about optional needle valve assemblies....Mr. Pratt has something different on his Primary force with the LA 25.....could someone enlighten me.

I believe the photo can be seen at, from 2000 nationals???

http://clflyer.tripod.com/images/Photos%202002/P1010021.jpg

Title: Re: OS LA25 needle valve options?
Post by: Leester on July 11, 2006, 08:45:12 PM

It's what is on mine, but I just checked the box and mine says LA not LAS. So my guess is it's a ST NVA. Funny I bought mine new from ,Oh it doesn't matter.

Title: Re: OS LA25 needle valve options?
Post by: Alan Hahn on July 11, 2006, 09:22:56 PM

Sort of looks like a ST assembly or a close variant. There is nothing special about the spraybar you use. I scored a lot of ST spraybar assemblies from Tower Hobbies a couple of years ago, so that's what I use. At that time I was running thru spraybars quite fast (a result of learning outside maneuvers and engine quittings while inverted--tough with a profile). As long as you can deal with the slightly wider width (which restricts the venturi over an OS spraybar assembly). Compared to the ~$15 cost of an OS assembly, I can live with drilling out the crankcase to push the spaybar thru. If you need the power lost in the restriction, you can always drill open the venturi a little more.

Title: Re: OS LA25 needle valve options?
Post by: jeffindayton on July 13, 2006, 04:43:16 PM

ST as in SuperTigre and NVA as in???

Title: Re: OS LA25 needle valve options?
Post by: Bill Little on July 13, 2006, 05:03:50 PM

Quote from: jeffindayton on July 13, 2006, 04:43:16 PM

ST as in SuperTigre and NVA as in???

ST=Super Tigre
NVA= Needle Valve Assembly

Needle, spray bar w/nut, and needle locking nut in the case of the ST.