In order to tell if it's working correctly, you should really measure the crankcase vacuum (with the breather reinstalled). To do this, you can make a U-tube manometer (I've attached the service manual page that explains it) and connect it up. If you don't have a vacuum, then the breather is most likely your problem. If you do, then it's something else.
I'm trying to remember what the Kohler twin breather looks like inside, but I think you're looking for a dirty or broken reed valve, for starters. Deteriorated gaskets don't help either.
|