Thank you Doug for the information. Sorry I have not responded to your comments I have not loged on to this site in almost a year. My engine does have a piston type pump. I did order them from the company Altopro, they are made by Kissan. I ended up emailing the company and they told me the 4 hp Petter gears on the side of the engine are oiled from vaporized oil that makes its way through two openings in the castings. The 12 hp Petter has oil galleries that pass through the crank and spin out from the cam gear on the side. Personally I think the 4 hp Petter should have pressurized oil to those gears. In time I will come up with something. I would like to see your pictures of the Petter flat belt pully.
Jim