Znen PCV system pic By twowheeler (Read 473 times)

[twowheeler]

Top goes to air box, one bottom is a plugged drain and the other goes to the valve cover vent.

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[Bashan]

You're supposed to pull the plug and empty the drain hose from time to time. The valve cover vent is the crankcase breather and the airbox makes a negative pressure to pull the fumes out. The EPA insists on having the negative pressure to pull fumes out. They work just as well open to the air IMO.

[twowheeler]

I have since reversed the position and have the single drain pointing down and the others going to the valve cover and the breather which is open.

[Bashan]

Why did you do that TW? I'm just curious. Actually, you could just take the canister off and plug the airbox hole. Then tie off the hose from the valve cover up above the top of the valve cover and put an old fuel filter on it. That way the oil that accumulates in the hose runs back down into the engine.

If you've ever noticed a plugged clear tube hanging out of the back of the side airbox on some scooters, it's analogous to the drain tube on your canister. It's a reservoir for the crankcase breather residue. If it doesn't accumulate anything is it a residon't? I'm very sorry, that was a horrible pun.

[twowheeler]

I found that most of what was collecting was combustion byproduct (moisture) and didnt really want it going back in.