Honda Service Repair Manuals


1973 Trailsport 90 (ST90K0)

  • ENGINE
    • The engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
    • Spark plug: D6HA
    • Plug gap: .028
    • Battery: 6N5.5-1D -- 6 volt
  • DRIVETRAIN
    • Drive chain: #428 x 94
    • Front sprocket: 15 T
    • Rear sprocket: 40 T
  • CHASSIS / SUSPENSION / BRAKES
    • N/A
  • DIMENSION
    • N/A
  • OTHER
    • Colors:
      • Tahitian Red
      • Mighty Green
    • The "HONDA" was yellow-orange with a black outline
    • There was a cylindrical tool box behind the seat
    • The headlight nacelle (shell) was black and the shock springs were chrome
    • The serial number began ST90-1000002.
1973 Honda ST90K0
1973 Honda ST90K0

1974 Trailsport 90 (ST90K1)

  • ENGINE
    • The engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
    • Spark plug: D6HA
    • Plug gap: .028
    • Battery: 6N5.5-1D -- 6 volt
  • DRIVETRAIN
    • Drive chain: #428 x 94
    • Front sprocket: 15 T
    • Rear sprocket: 40 T
  • CHASSIS / SUSPENSION / BRAKES
    • N/A
  • DIMENSION
    • N/A
  • OTHER
    • It came in only one color: Bright Yellow
    • The "HONDA" decal was yellow with a black outline
    • The stripe was black and orange
    • There was a cylindrical tool box behind the seat
    • The headlight nacelle (shell) was black and the shock springs were chrome
    • The serial number began ST90-1100001.
1974 Honda ST90K1
1974 Honda ST90K1

1975 Trailsport 90 (ST90K2)

  • ENGINE
    • The engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
    • Spark plug: D6HA
    • Plug gap: .028
    • Battery: 6N5.5-1D -- 6 volt
  • DRIVETRAIN
    • Drive chain: #428 x 94
    • Front sprocket: 15 T
    • Rear sprocket: 40 T
  • CHASSIS / SUSPENSION / BRAKES
    • N/A
  • DIMENSION
    • N/A
  • OTHER
    • Colors: Candy Topaz Orange
    • The "HONDA" decal was yellow with a black background
    • There was a cylindrical tool box behind the seat.
    • The headlight nacelle (shell) was now orange instead of black and the shock springs were black instead of chrome
    • The serial number began ST90-1200004.
1975 Honda ST90K2
1975 Honda ST90K2



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