Briggs and Stratton 16 hp opposed

[Pleyden]

Hi Looking for reasons. I have a 16 hp Briggs opposed horizontal on my bolens tractor. It starts an runs great however the crank case breather hose pumps out and oil at a elarming rate. I have resorted to a catch bottle and a longer hose to collect the oil. Now you would say it's the rings causing blow by. It doesn't smoke at all. I have put new. Valve seals on all of the four valves. Question what else other than rings can it be. Any suggestions are welcome. Other than get a new tractor

 

[bertsmobile1]

The usual reason is a sticky float filling the sump with fuel, or just plain overflling.
After that leaking exhaust valve guide
leaking head gasket