回答“gas line top or bottom on gas tank”There are two hoses on the gas tank of the FA50. The lower one goes to the reserve section on the petcock and the higher one goes to the normal setting on the petcock.
回答“What type of gear oil do you use in a fa50?”The FA50 should only have 10w30 oil. Whether normal or synthetic will not make any difference to the performance. Too much oil will cause problems so measure carefully. The gear train sits in the oil and so does the clutch. Replace the oil once a year at least. I often add a little oi additive like Slick50 or Motorcoat to keep the gears well lubricated.