Jeff. The crankcase vent will either dump to tube hanging out of the cowling, or a fitting on the intake manifold. Whichever setup your engine started with is the one you should use. There is some raw fuel that blows by into the crank case. On the engines that dump to outside air, it isn't an issue, but the ones the are vented to the intake, well it effects the mix of the engine and failure to keep the stock plumbing is going to result in a hard to tune engine.

This problem is highlighted by a couple 120 pumpers I've worked on in the last couple months. One is a Surpass IIant the other a Surpass III. both had pump issues that was dumping raw fuel from the pump into the crank case. This fuel was finding it's way up the vent to the intake manifold and really screwing up the carb mix, to the point neither engine was flyable anymore.

The crank case vent is a part of the design of the engine. Failure to follow the design is going to result in frustration on the users part.It may even result in damage to the internals of the engine. Use a really long tube on the vent or dump it into a canister can screw up the overall flow of fluids through the engines.These fluids arewhat lubricates the bottom of the engine. The externally vented ones need as short as possible vent tube. The internally vented ones, IEcrankcase to intake manifold also require a short vent line or the pressure in the crank will build and choke the engine.

Check the manual for your engine and follow it.