Honda Trailsport ST90 Motorcycles

1973 Trailsport 90 (ST90K0)

Engine
Engine Type	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.

1974 Trailsport 90 (ST90K1)

 

Engine
Engine Type	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.

1975 Trailsport 90 (ST90K2)

Engine
Engine Type	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.

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