Anyone got a clue on what threads are used for OS RC NVAs? It is not English or metric.
The thread I am looking for is for the assembly housing that goes in the Venturi not the needle. Thanks.
If it is the larger 4D-7D carbs, it looks like OS used 1/4"-32 UNEF thread.
Oh my! I was unaware until fairly recently that this is a common British modeling (as in steam engines, etc) thread, but that OS uses it seems nuts. Brett
The 1/4"-32 used on the glow plugs is your (USA) Unified thread Brett.
Here are the parts in question. Super Tigre 51Venturi and OS NVA.
.194
m5 x 0.8 is your thread Tom.D