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.
Topic: OS LA25 needle valve options? (Read 851 times)