Redneck intake or straight to carb?

[Gummerfan]

I've had a Uni on my 300 xrx for a while now. I just attached it straight to the carb, like on a motorcycle. Is this wrong? Do I need an intake pipe? What size pvc would I need if I have to go that route?
I've seen filters attached to the carb, but I read somewhere that you need like c 6 inches of intake?

[ckau]

That length of pipe between the filter and carb is to reduce tubulance and organize the air flow resulting in a larger volume of air entering the carb. Without the pipe a rich, unstable condition occurs due to lack of air. I see no reason why the same principle won't work for the 300. Try it and see.

[GX150]

CN250 and CF250 engines don't need the intake plenum. Your xrx300 has the cylinder horizontally like a GY6 instead of vertically, but I don't think that should make a difference.