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webbike·
notfpSingle-CylinderUnder 125ccClassic & Vintage Motorcycles
··7 min read

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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