Honda Trail Bike (CT90) Motorcycles

1966-68 Trail 90 CT90K0

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Clutch	automatic
Chain	#428 x 104
The early 4-speed model had a dual overlay rear sprocket setup The later models had a single sprocket but an 8-speed dual range transmission
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used a bottom link rather than telescopic fork tubes
DIMENSION	N/A
OTHER

• Colors:
  • Scarlet Red
  • Yellow
• The exhaust was up-swept.
• The exhaust system and heat shield were chrome.
• The seat was a solo seat with chrome trim.
• The chrome luggage rack behind the seat was standard equipment.
• The fuel tank decal reads “HONDA 90”
• The serial number began CT90-100001

1969 Trail 90 CT90K1

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Clutch	automatic
The early 4-speed model had a dual overlay rear sprocket setup The later models had a single sprocket but an 8-speed dual range transmission
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used a bottom link rather than telescopic fork tubes
DIMENSION	N/A
OTHER

• Colors:
  • Scarlet Red
  • Yellow
• They were accented with a gray plastic shroud.
• The exhaust system and heat shield were chrome.
• The seat was a solo seat with chrome trim.
• The chrome luggage rack behind the seat was standard equipment.
• The fuel tank had no decal, but the down tube reads “HONDA”.
• The serial number began CT90-200001.

1970 Trail 90 CT90K2

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The early 4-speed model had a dual overlay rear sprocket setup The later models had a single sprocket but an 8-speed dual range transmission
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used a bottom link rather than telescopic fork tubes
DIMENSION	N/A
OTHER

• Colors:
  • Scarlet Red
  • Bright Yellow
• They were accented with a dark gray metallic plastic shroud.
• The side covers were also gray.
• The handlebars had a swivel lock
• The exhaust system and heat shield were chrome
• The seat was a solo seat with chrome trim
• The chrome luggage rack behind the seat was standard equipment
• The fuel tank had no decal, but the down tube reads “HONDA”
• The serial number began CT90-300001.

1971 Trail 90 CT90K3

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• Colors:
  • Scarlet Red
  • Summer Yellow
• They were accented with a dark gray metallic plastic shroud
• The side covers were also gray
• The frame shroud had a vertical black stripe
• The handlebars had a swivel lock.
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome trim
• The chrome luggage rack behind the seat was standard equipment
• The fuel tank had no decal, but the down tube reads “HONDA”
• The serial number began CT90-400001.

1972-73 Trail 90 CT90K4

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Mars Orange
• It was accented with a dark gray metallic plastic shroud
• The side covers were also gray
• The frame shroud lost its vertical black stripe
• The handlebars had a swivel lock
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The fuel tank had no decal, but the down tube reads “HONDA”
• An auxiliary fuel tank was mounted on the left side of the rack
• The serial number began CT90-1400001.

1974 Trail 90 CT90K5

Engine
The engine was improved to a 89cc OHC single cylinder
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Mars Orange
• It was accented with a dark gray metallic plastic shroud
• The side covers were also gray
• The handlebars had a swivel lock. The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• The fuel tank had no decal, but the down tube reads “HONDA”
• An auxiliary fuel tank was mounted on the left side of the rack
• The serial number began CT90-1500003.

1975 Trail 90 CT90K6

Engine
The engine was a 89cc OHC single cylinder with an automatic clutch
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Tahitian Red
• The frame shroud and side covers were the same as the body color
• The “HONDA” decal on the shroud was black
• The handlebars had a swivel lock
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• An auxiliary fuel tank was mounted on the left side of the rack
• The serial number began CT90-1600003.

1976 Trail 90 CT90’76

Engine
The engine was a 89cc OHC single cylinder with an automatic clutch
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Shiny Orange
• The frame shroud and side covers were the same as the body color
• The “HONDA” decal on the shroud was yellow
• The handlebars had a swivel lock
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• An auxiliary fuel tank was mounted on the left side of the rack
• The rear shock springs were chrome and they also had external springs
• The serial number began CT90-1700004.

1977 Trail 90 CT90’77

Engine
The engine was a 89cc OHC single cylinder with an automatic clutch
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Shiny Orange
• The frame shroud and side covers were the same as the body color
• The “HONDA” decal on the shroud was black
• The handlebars had a swivel lock
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• An auxiliary fuel tank was mounted on the left side of the rack
• The rear shock now had external springs and they were chrome
• The serial number began CT90-1800008.

1978 Trail 90 CT90’78

Engine
The engine was a 89cc OHC single cylinder with an automatic clutch
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Bright Yellow
• The frame shroud and side covers were the same as the body color
• The “HONDA” decal on the shroud was white
• The handlebars had a swivel lock and were now black
• Also the wheel hubs were black
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• An auxiliary fuel tank was mounted on the left side of the rack
• The rear shock springs were now black
• The serial number began CT90-1900010.

1979 Trail 90 CT90’79

Engine
The engine was a 89cc OHC single cylinder with an automatic clutch
Spark plug	D8HA
Plug gap	.028
DRIVETRAIN
Chain	#428 x 104
The transmission was an 8-speed dual range
Front sprocket	15 T
Rear sprocket	45 T
CHASSIS / SUSPENSION / BRAKES	N/A
The front suspension used telescopic fork tubes
DIMENSION	N/A
OTHER

• One color was available: Tahitian Red
• The frame shroud and side covers were the same as the body color
• The “HONDA” decal on the shroud was still white, but much larger than the previous year
• The handlebars had a swivel lock and were now black
• Also the wheel hubs were black
• The exhaust system was black and the heat shield were chrome
• The seat was a solo seat with chrome rivets
• The chrome luggage rack behind the seat was standard equipment
• The turn signal housings were chrome
• An auxiliary fuel tank was mounted on the left side of the rack
• The rear shock springs were now black
• The serial number began CT90-5000011.

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