Honda CT90 (Trail 90) Specs, Manuals, & Info

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If you’ve got a CT90, or Trail 90, that you’re working on, you’ve come to the right place.

Whether you’re doing a full rebuild or restoration motorcycle project or you just need to complete some routine maintenance, we’ve got all the information and links to what you need to do the job right.

On this page you’ll find:

  • Links to the motorcycle service manual for your CT90.
  • Where you can find used CT90s for sale to start a new motorcycle project or get a parts bike.
  • Specs, details, and information about the history of the CT90. may earn an affiliate commission when you make a purchase through the links on this page.

CT90 Specs & Details

The Honda CT90 “Trail 90” was the first true dual sport motorcycle.

It was manufactured from 1966 to 1979 following some dealer-specific modifications that were popular in the U.S.

The CT90 was designed for the trail and the outdoorsmen, but also suited city commuters and those who needed something to get around and work a large property.

The bike was designed to be easy to use on tight steep trails and for hauling gear.

It was also designed to be rugged. The design of the intake made it so that bike could be pretty much submerged and continue running. The spark-arrestor exhaust made it safe for off-road use.

Early models featured a dual-sprocket, which the rider would need to swap on the hub and add a chain to use the low gear climbing capabilities.

Later models included a sub-transmission gear box, that allowed you to make the switch by coming to a stop and flipping the lever.

The CT90 also features an automatic clutch. Shifting through the gears simply requires the foot, and forward motion just requires the throttle. When the bike comes to a stop, it won’t try to move until you give it throttle again, making it ideal for steep, narrow trails.

Specs for the Honda CT90 include:

  • Top Speed: 55 mph.
  • Engine Displacement: 89cc
  • Cylinders/Engine Type: 1, overhead camshaft.
  • Transmission: Automatic 4 speed. dual sprocket on early models, dual-range on later models. Gearing pattern goes N 1 2 3 4
  • Wet Weight: 200 pounds.

Honda Trail 90 Top Speed

These little bikes are obviously not designed for speed.

A perfectly tuned CT90 under good conditions with a rider of average weight can get up to about 50 to 55 miles per hour.

Road conditions, rider weight, engine tuning, wind, and grade will all play a factor in how fast you can actually go on the bike.

A more realistic top speed for most of these bike is likely around 40 to 45 mph.

CT90 Years & Variations

  • 1966 CT90 K0
  • 1967-68 CT90 K0 (introduction of the dual-range sub transmission).
  • 1969 CT90 K1
  • 1970 CT90 K2
  • 1971 CT90 K3
  • 1972-73 CT90 K4
  • 1974 CT90 K5
  • 1975 CT90 K6
  • CT90 ’76
  • CT90 ’77
  • CT90 ’78

Find a Honda CT90 for Sale Near You

If you’re looking for a CT90 of your own or need a donor parts bike for your current motorcycle project, you can use the used bike search tool to find what you’re looking for.

Click your state below to find used CT90s near you.

These motorcycle search engines search Craigslist listing for the entire state so you don’t have to individually search each specific region.

Once you’ve got the bike up and running, be sure to check back to our motorcycle registration and title guides if you need help getting plates (Especially if you’ve bought the CT90 without a title).