My 70 S2A is bucking at high power settings. e.g. 45-50 MPH especially going uphill until I let off the gas until it begins running smoothly. I have inspected the filter screen at the carburetor and it is clear. The see through in line gas filter is full and appears clean.
Could my problem be because the mechanical fuel pump can't keep up? FYI, I have an in line electric fuel pump mounted before the mechanical pump. Any ideas??