OS-25LA needle

Stuka Stunt Main Forum · 4 of 4 known posts recovered

planenuts · Jul 10, 2003 12:18 PM

Does anybody know if the needle valve assembly from an OS 25 FS will fit on the LA? I really hate the needle valve arrangement on that engine.

Richard Koehler

Steve Helmick · Jul 10, 2003 01:22 PM

#1 source

You maybe mean FP? Yes, that should bolt in. When I helped Ben Jones and Brad Parker with their stock .25 LA's, I didn't like the RNV either. If you are not using good fuel, tho, it won't matter. 18% synthetic oil RC fuel is NOT good enough. Steve

planenuts · Jul 11, 2003 11:24 AM

#3 source

Until I run out I'll probable stick with Sig 25% castor in the LA. Been running MORGAN OMEGA that I've removed 6 oz. out of a gallon, and added back 7 oz of castor in my double star 40 and Novell engines and it seems OK. Is the OS-25 an ABC engine?

Richard Koehler

LNeumann · Jul 10, 2003 04:19 PM

#2 source

>Does anybody know if the needle valve assembly from an OS 25
>FS will fit on the LA? I really hate the needle valve
>arrangement on that engine.

The needle used on the 20/25/35/40 FP is the same and it fits the 25/40/46 LA engines. So do the respective venturis.

Leonard Neumann