RE: Fuel for old engines
The critical needle valve setting I hadn't thought of before. Years ago some one told me you need nitro for idle. Back in the 60's I have a Veco .45 and a Super Tiger .23 . The .45 would not dependable idle as slow as the .23 .Some one told me I needed fuel with more nitro so I thought you needed nitro for the idle. I never touched the low speed needle on the .23. But I messed with the .45 all the time I never was happy with its idle.