Depends on the model and what, if any modifications or add ons have been installed. Please be more specific.
depends on model and condition jeet@aol.com
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!
The 1983 FXSB came stock with a Keihin B28E 38mm butterfly-type carburetor.
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