Bogg usually isn't caused by lack of oil. Usually if you have a lack of oil, the piston fails, scoring a cylinder.
To adjust the pump, there is a cable that lifts the oil pump lever when you hit the throttle. There should two marks on the lever and a mark on the oil pump. Align one mark on the lever with the mark on the pump at idle; pin the throttle and see if it is aligned at wide open. The cable has an adjuster nut, loosen the nut and turn the adjuster until the marks align. I choose to align mine at WOT as opposed to the mark at idle, it's more important to me to have adaquate oiling at wide open.
Your bog could be carbs (try cleaning them, making sure the pilot jet circuit and pilot jets are clean) or clutching (check for worn parts or a worn belt). If the belt is riding down into the secondary at all, you may be able to adjust the secondary to move it so it rides about 1/16 to 1/8" above the secondary...
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