Yes, on the bikes that had the breather tube going into the air boxes it was sucked back into and burned in the engine.
That came late in the production run. The first few years the breather had two hioses and one went to a hole in the left side engine cover and any oil blow by was directed to drip on the chain. They found this venting produced too much blow by with the 3000 cc oil capacity. They dropped the oil level to 2500 cc's and plugged one of the breather outlets and just ran one hose.
They also put a restricter plug in the one line. They then went to a smaller breather box with one hose.
They eventually routed this hose to the air boxes.
No when removing the stock air box there are several things to do with the hose. I chose to use a power brake chack valve. at most parts stores there is a HELP! section on the display racks. On there somewhere you will find a Part number 80190 Poweer Brake Chreck valve. Don't try a positive crank case valve for a car, it won't work.
Now this check valve has a large end where it plugs into the power brake booster on the car. It's just the right size to plug into the breather hose. Now at this point you can either cut the hoes just long enough to plug the valve in and run a hose from the 3/8 fitting on the valve to below, behind and to one side of the engine. This lets any oil drip on the road without getting on the rear tire. Or in the hole in the left cover, If you have a hole. They deleted it when they went to the breather to air box air hose.
Or long enough so it hangs just above your new air cleaner. This lets any oil to drip on the air filter and be sucked into the engine.
The brake check valve does a couple things. It is a one way valve that lets any pressure in the crank case to get out. It also prevents any air from flowing back in.
This creates a vacumm inside the engine. This vacumm can help prevent small oil leaks. It can also help the rings seal better.
Leo
