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Harley-Davidson motor company was founded in 1903
Harley Davidson recommends it (Citco I think) but No!!! Just use the correct weight for your motor, time of year and how you ride it!
2011
2007
1977
2008
1966
Road Kings were introduced in 1980 with a Shovelhead motor.
Harley Davidson had a rough patch in 1983.
2006 Harley Davidson introduced the Dyna motorcycles with a 6 speed transmission, and in 2007 the 6 speed was added across the board.
Its a 1979 cart
The very first Harley Davidson Sportster was produced in 1957.