chasesa wrote:

Chasesa, you have the same set-up as I did (71 motor) which means you already have a timed breather built in to the end of the camshaft on the drive side.
The problem some with that set-up is air can only escape through 1/4 hole, when I bought my 71 it was a rolling basket, so when I split the cases I drilled two holes in the timing side, then exiting where the 850 does and completely blocking off your exiting breather.

Now, I am really confused.

Can I install a PCV valve on my 1968 Commando, or not. If so, where should it be placed?
Stephen

You can also add something, the real question is do you need to? Is the engine leaking oil anywhere it shouldn't? Do you ride the bike hard?

My guess is that with the Combat in 72 they knew that the bikes would be ridden even harder and needed better breathing than the timed breather could provide.

I have a small and very annoying leak from the bottom of the timing cover. I will try again this winter to replace and silicone a gasket into place. Other than that, no leaks of consequence.
Stephen

A norton commando timing cover gasket should not require any silicone, just clean surfaces with brake clean and install.

cheers.

The PVC from Mikes XS is a great unit. The inlet fits the hose coming from the engine, but the output is to big. I pulled the output pipe out of the pvc with not much effort. With no machining required, I tapped it with a 1/4 pipe tap . A 3/8 barb to 1/4 pipe fitting was applied. Cause this is a 90 degree application, I attached it at the top of the oil tank and came straight to from the vent connection tube on the oil tank. Looks very proper and works like dream.