Main Motorcycle: Rickman T120
Join Date: May 2010
Location: Victoria Australia
Other Motorcycle: T160,TR6
It seems to work well enough.Triumph did it on later OIF frames,connecting the oil tank breather to a fitting at the top of the exhaust rockerbox.
The crankcase fumes from the oil tank then need to escape down the exhaust pushrod tube,through the tappet-block holes and into the crankcase,to finally escape out the crankcase breather.Eventually it goes into the same breather hose as the earlier system,running to the rear mudguard.
It looks tidier,but I don't think it works quite as well.
*Crankcase fumes returned to the oil tank are again returned to the crankcase,before they exit the breather.
*Those fumes from the oil tank (about 1/2-pint/minute at 4000 rpm),have to blow through the tappet block holes to reach the crankcase.Oil is trying to drain through those holes,and that oil lubricates the cam lobes and tappets (they will get some other oil splashed off the crank).There isn't actually a lot of oil draining from the rockerbox,about 2 teaspoons per minute or less.
None of this may matter,and it may work equally well.I don't know of any complaints or problems.