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  #21  
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Here's a $23 reed valve.
https://www.mikesxs.net/yamaha-xs650...valve-pcv.html

This pic is from bluto showing the size:
[/QUOTE]
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  #22  
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I wondered how big that thing was. I was looking at one of those a while back. I like the idea of reeds, but they're generally either huge or impossible to mount in any sort of sensible fashion.
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Yeah I was searching for one and found those big honking looking ones.
norsexl has one on his bike. You may could get some hookup info from him if you decide to go with that one.
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I also found with testing that a smaller outlet hose than the breather outlet reduced vacuum in the engine.
So the bigger the outlet from the breather lets the umbrella to close faster giving you more vacuum.

Smaller outlet than the breather allows the umbrella to float more with higher revs thus reducing vacuum.
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When I first put a valve on I was a little concerned about how it might affect the oil return system.
The IH oil return system depends on the movement of air from the inside of the engine to the outside. I wasn't sure how much vacuum would be produced with the XLCR breather but it was used by HD on their engines so figured it would be OKon mine.

Didn't seem to affect the oil return from what I could tell.

Probably does help reduce oil leaks.
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It wont affect oil return to the tank because the tank is at the same pressure as the cam chest via the vent hose from the top of the tank to the cam chest.
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Too much vacuum can hinder oil scavenge on 77-up engines.
The trade off is more vacuum is good for ring seal but less for scavenging and gaskets.
And more positive from downstroke is good for scavenging but less for ring seal.

I've found by manipulating the outlet size and breather, you can manipulate CC pressure to an extent.

I wish I could get some info on crankcase pressure in IH's.
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The system uses the + and - pressures to help the oil move along the channel at the rear of the case. The oil is scraped off the flywheels into a channel that runs to the left side of the engine. If you manage to get too much vacuum the oil return system MIGHT not work as effectively.

Apart from that it's a win as far as I know. Less volume/lower pressures in the crank case is a good idea. Some race engines use electric pumps to help lower the pressures in there.
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I haven't had a problem with oil return.
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There is no pressure differential between the oil tank and the crank case.

So STOP with the too much vacuum talk!

Any vacuum in the motor is applied to the tank through the vent line, as that assists with removing condensate from the tank. This balances the tank pressure with the crankcase pressure.
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