Bing 64 tuning on a 4 stroke

[WurlyBird]

Sorry, not trying to be dismissive, but I’m trying to get past the simplest explanation.

So I get how the 64 differs from the 54, and I have seen the exploded diagram. I also understand the operation of all three circuits and the purpose of all three jets. But is there any information on the tuning of a Bing when attached to a 4 stroke? Or is there any difference? It seems to me there should be a difference since there is actual valves instead of ports, they are not the same engines. Do other people think my operational description points to jets or might there be another issue with the CV carb? Why is there a thousand articles on tuning carbs for 2 strokes and not a one for the same Bing carb on a 4 stroke. I have spent hours searching for this and it seems illusive.

As it stands I will try and tune it similar to a 2 stroke since there is no better information. I expect marginal results.

[avidflyer]

On my 912 UL, I set the jet needles richer in the winter. Didn't need to change the main jets though. But if I had to I would. Not quite as cold as Alaska, but I'm in northern Mn. JImChuk

[WurlyBird]

Thank you. At least now I know I won’t be the only one tinkering with jets. Tonight I am going to pull the main jets to see what their size is and order the next two sizes. I was leaning toward raising the jet needle until it got hot at full throttle, so I’ll adjust the main first. Alaska can keep aviation interesting, we are only a couple months away from -2000’ DA.