Honda ST90

Honda ST90
Manufacturer	Honda
Production	73-75
Class	Trail
Engine	90cc
Top Speed	43 mph
Spark Plug	NGK D6HA 73-75
Battery	YUASA 6N5.5-ID 73-75
Final Drive	Chain: 428x94
Front Sprocket	15T
Rear Sprocket	40T
Front Tire	3.00-14 73-75
Rear Tire	3.00-14 73-75
Weight
Recommended Oil	Honda GN4 10W-40
Related	Honda CT70
Manuals	Service Manual

The Honda ST90 was a small trail bike made by Honda starting in 1973.

This was the only Honda trail bike to have the designation ST. Other ST models by Honda are "sport touring" motorcycles. It was comparable to say the Honda CT90.

1973

1973 Honda ST90 in Tahitian Red

1973 Honda ST90 in Tahitian Red

1973 Honda ST90 in Mighty Green

1973 Honda ST90 in Mighty Green

• 1973 Trailsport 90 (ST90K0)
• 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 engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
• The serial number began ST90-1000002.

1974

1974 Honda ST90 in Bright Yellow

1974 Honda ST90 in Bright Yellow

1974 Honda ST90 in Bright Yellow

• 1974 Trailsport 90 (ST90K1)
• 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 engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
• The serial number began ST90-1100001.

1975

• 

  1975 Honda ST90

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  1975 Honda ST90

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  1975 Honda ST90

• 

  1975 Honda ST90

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  1975 Honda ST90

• 1975 Trailsport 90 (ST90K2)
• 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 engine was a 89cc single cylinder with a 3-speed transmission and an automatic clutch
• The serial number began ST90-1200004.