According to the service manual for the 1989 Kawasaki Ninja 750R (ZX750F), these are the amounts of oil for the front fork tubes:
Changing oil: 325ml
Complete disassembly: 380+/-4ml
The fork oil level (when forks fully compressed) should be at these levels (+/- 2mm):
Left tube: 120mm
Right tube: 149mm
The Ninja 750R is also known as the GPX750R in Europe, and was sold in the US from 1987 to 1990.
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