1989 Honda FL400R Pilot Service Manual, Page 252Get this manual
TROUBLESHOOTING
POOR PERFORMANCE AT HIGH SPEEDS
PROBABLE CAUSE 1Disconnect fuel tube at carburetor FUEL FLOWS OUT FREELY FUEL FLOW Clogged fuel filter Clogged or kinked fuel line Clogged fuel tank cap breather hole Clogged fuel valve Clogged fuel pump vacuum tube Faulty fuel pump
2.Check ignition timing CORRECT