I have made a new 4V oil pump with double needle bearings and steel gear (for me the only solution), have a look my Horvath Guzzi Page and go to fakten-produkte-ölpumpe.
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Price for oil pump is 595. - euros.
The gear on the crank is original guzzi, the big gear is 220.- euros and the oil pump gear is only available with the pump, but for the old models like t3 and lemans you can use the same gears, because my new pump has the same shaft as the t3 pump. So, a complete set for the t3 models is 520.- euros. Gear Dampers shown bottom photo.
Regards, Peter
**AND Tappets available too, made from 42crmo4 chromoly steel, price each 60.- euros.