Remove the socket head plug located next to the oil dipstick knob and observe the level on the dipstick attached to the plug. If necessary add transmission oil thru that same hole.
20- 24 ounces
Tis underneath the transmission on the left front of the square oil tank.
1999 Harley Davidson fuel line diagram
Harley-Davidson Race Across America - 1999 VG is rated/received certificates of: USA:E
According to Harley-Davidson, a 1999 Fat Boy gets 56 mpg on the highway and 43 mpg in the city. Your mileage may vary.
carburated
58 hp
Three
you need to take title or registration to a Harley dealer so they can order one
The motor oil drain plug is located on the underside of the transmission, closest to the right side of the bike. The one closest to the left side is the transmission drain plug.
In 1999, Harley-Davidson produced approximately 8,000 units of the 1200 Sportster model. The Sportster line was popular during this time, contributing to Harley-Davidson's strong sales. Exact production numbers can vary slightly based on different sources, but this figure gives a general idea of production for that year.
80/90 semisynthetic hypoid gear oil is what the factory put in it but I use Red Line Heavy ShockProof fully synthetic gear oil. Not cheap but neither was your Harley.