Honda ST90
The Honda ST90 is the larger, 89cc sibling to the iconic CT70, built for only 3 years from 1973-1975. Its relative rarity and classic T-bone frame design make it a prized find for Honda mini-trail collectors.
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Honda introduced the ST90 in 1973 as a bigger, more street-focused sibling to the wildly popular CT70. Built on a similar pressed-steel T-bone frame, it featured a larger 89cc overhead-cam single-cylinder engine and a 3-speed semi-automatic transmission. Unlike the dual-range gearbox on many CT models, the ST90's setup was simpler and better suited for pavement, though it retained a rugged, go-anywhere look.
The ST90's appeal to collectors comes from its relative rarity. It was only produced for 3 model years, from 1973 to 1975, and didn't sell in the same massive numbers as the smaller 50cc and 70cc bikes. This scarcity, combined with its classic Honda minibike charm, makes clean, original examples highly sought after. They offer a bit more power and road presence than a CT70, making them more usable for around-town trips.
The market for ST90s is strong, with restored or exceptional low-mileage bikes fetching premium prices. The average sale price hovers around $3,800, but top-tier examples have sold for over $7,000. Project bikes can be found for under $2,000, but restoring one can be costly as certain ST90-specific parts are harder to source than components for more common models.
Buying Tips
- Check the pressed steel monocoque frame for rust, especially along the bottom seams and under the seat. It's the structural backbone of the bike and difficult to repair properly.
- Verify the engine's health. The 89cc OHC single is generally reliable, but look for signs of oil smoke on startup and listen for any rattles from the cam chain.
- Confirm originality. Many of these bikes were modified. Original paint, decals, exhaust, and lighting are key value drivers. Parts unique to the ST90, like the speedometer and taillight bracket, are tough to find.
- Test the 3-speed semi-automatic clutch. It should engage smoothly without slipping or grabbing. Jerky shifts can indicate worn clutch components.
Prices range from approximately $1,600 for project bikes to over $7,400 for concours-quality examples.
38 Honda ST90 vehicles have been tracked across auctions and listings on Hypercars, with 1 currently live.
Data sourced from Bring a Trailer, Cars & Bids, eBay Motors, PCarMarket, and Collecting Cars. Updated daily.
Frequently Asked Questions
How many Honda ST90 listings are for sale right now?
There is 1 Honda ST90 listing currently live across auctions, dealers, and marketplaces tracked by Hypercars.