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no
4.2 gallons
for wire harness maintenance
If it is an EFI model it is inside the fuel tank.
oil tank
buy a pump and drain tank only, do not run dry if it's fuel injection
It's not necessary to remove the tank but the job will be much easier if you raise the tank up a bit and remove the air cleaner.
Yes.
There is a 3/8" hose off the back bottom of the oil tank. At the end of the hose there is a plug clamped on. Remove the plug over a drain pan, clamp the plug back in place when drained.
how to remover oil tank 1988 sportster
3 qts 20w50 in the oil tank, about 20 oz in the tranny and 1 qt of primary lube in the primary.
You can just raise the tank a bit without removing it altogether. It also helps to remove the air cleaner to get more working room.