Quote Originally Posted by champ20B View Post
With a single carb feeding "alternate acting" cylinders, there would actually be a constant flow through the carburator. Where one piston stops pulling air, the other piston pulls. But any time you have one carburetor per cylinder that is isolated to one cylinder in induction, then the air flow is only repetitive (on/off). Because of this, it may be necessary to have a bigger jet to ease flow feed of fuel under this condition to keep primed.

Interestingly, a twin cylinder alternate firing arrangement with a single carburator can be much better than a twin carb/ twin cylinder arrangement....unless the two carbs are feeding at once through an interconnected intake path as a progressive stage systematic throttle, which I never seen on an outboard. It might be a good idea though....Ive seen this on old cars with twin carbs.
Don't tell the hundreds of Konig's and Za Quincy motors that for they might not run! Steve