ORIGINAL: earlwb
The engine design is such that I would highly suggest running a low nitro glow fuel with 20% castor oil in it, no synthetic oil or blends. 10% nitro is probably a good way to go.
K&B used a couple three different carbs on the engines over the years.
The Perry Carb was quite popular for a long time.
it has a brass disc opposite the needle valve you use for setting the idle mixture. But you seldom needed to mess with it.
K&B later used a carb of their own on the engines. Like shown here for example on the .65 engine.
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My .65's have K&B carbs on them identical to the one in that picture.. This seems to be the most common carburetor I've seen on older sportsters.
earlwb: That sportster .65 looks like one of the real old ones - the head fins are huge compared to the two .65's I have.. Has that engine even been ran? It looks pretty new.