I have another filter on the way and will change it as soon as it arrives Monday.
No one stocks it local that I found. I had no idea that this model/engine configuration was uncommon, but it must be. I rebuilt the carb and inspects the boot while doing it. I think that if the engine had been worn out by an abrasive leaking, the compression would be low, or at least it would not stop burning sometimes.
I will look into the pressure relief and PCV valve also.
Thanks to those who read my post, it is longer than most, wanted to cover as much as I could.