Everyone wants the number, so here it is: most 660cc kei trucks will see somewhere in the region of 60 to 75 mph flat out, given enough road and a flat piece of it. That figure is also close to useless, and the rest of this is about why.
Those are general figures for these model lines, reasoned from published engine specifications and the gearing these trucks were built with. We have not taken a stopwatch to one, and we do not publish measured top speeds.
Where the ceiling comes from
Two limits stack up. The first is the kei class itself: since 1990 a kei vehicle may not exceed 660cc, and before that the cap was 550cc. The second is a self-imposed ceiling the Japanese manufacturers held to for decades, of 64 PS — about 63 hp — across the kei class.
Kei trucks never went near that cap. The cap was a constraint on hot kei cars. The working trucks were tuned for low-speed pull with a load behind the seats, and the naturally aspirated truck engines landed in the region of 40 hp. That is the whole story of their top speed.
| Engine family | Model line | Configuration |
|---|---|---|
| Honda E07A / E07Z | Acty | 656cc three-cylinder, mid-mounted under the bed |
| Suzuki F6A, later K6A | Carry | 657cc / 658cc three-cylinder |
| Subaru EN07 | Sambar | 658cc four-cylinder; some were supercharged |
| Mitsubishi 3G83 | Minicab | 657cc three-cylinder |
| Daihatsu EF-VE / EF-SE, later KF | Hijet | 659cc / 658cc three-cylinder |
Displacements and configurations are published manufacturer specification for these engine families. Output varied by generation and tune within each family; the roughly-40-hp figure above is a class characteristic for naturally aspirated kei trucks, not a rating for any one vehicle.
Top speed is the wrong number
Flat out and comfortable are very far apart on these trucks, further apart than on almost anything else you can buy.
The gearing is the reason. A kei truck is geared to move 770 lb of gravel away from a standstill on a slope, not to cruise. Top gear is short, so at 60 mph the engine is spinning hard and making itself heard about it, and there is nothing left for a hill or an overtake. The truck will hold that speed; you will not enjoy holding it.
Then there is the shape. A kei truck is a flat-fronted box on a 1,600 lb chassis with a short wheelbase. Crosswind moves it. Air coming off a semi moves it. Both are mild annoyances at 40 mph and genuinely unwelcome at 65.
In practice most owners settle somewhere in the 45 to 55 mph range for sustained driving, and plenty go lower. That is not the truck failing. That is the truck being used as designed.
What is on our lot, and what it does to the number
Three things on a specification sheet move a kei truck's realistic cruising speed, and we can count all three across the 743 trucks currently listed in our kei truck, mini dump truck and kei 4x4 categories.
| Specification | Count | Effect on speed |
|---|---|---|
| Four-wheel drive | 465 | Extra driveline and weight; often shorter final gearing |
| Two-wheel drive | 100 | The quicker configuration, modestly |
| Manual transmission | 673 of 743 | You choose the revs; five-speeds cruise better than four |
| Four-speed manuals specifically | 48 | One fewer ratio to spread, so a shorter top gear |
| Automatic or CVT | 69 of 743 | Easier, slightly slower; the CVTs are the newest trucks |
| Model year 1990 or earlier | 14 | Straddles the old 550cc class — slower again |
| Model year 1991 to 1998 | 448 | 660cc, narrower pre-1998 kei body |
| Model year 1999 onward | 281 | 660cc, later and generally better-geared |
Counts are of vehicles listed as available at the time of writing. Drivetrain is recorded on 574 of the 743, so the 465 and 100 are counts within those records; the remaining nine are RWD or FWD. Median model year across the fleet is 1998.
The headline there is that four in five trucks with a recorded drivetrain are four-wheel drive, and that is the configuration most buyers want — it is what makes the truck useful on wet grass and soft ground. It is also the slower one. That trade is almost always worth making, because the ground is where these trucks earn their keep and the highway is not.
The safety part, said plainly
We would rather lose a sale than skip this.
No kei truck has been crash-tested to any US Federal Motor Vehicle Safety Standard. They were never sold new here, so FMVSS never applied to them and nobody ever submitted one to NHTSA or IIHS. They were built to Japanese regulations of their era, which is a different standard and, for a 1990s truck, an old one.
The layout compounds it. These are cab-over designs: the driver sits ahead of the front axle, with the windscreen a few inches from their face and very little structure between them and whatever is in front. That packaging is exactly what makes the truck so usable — a full six-foot bed on a vehicle shorter than a Miata — and it is also why highway use is a different proposition from low-speed work.
Put a 1,600 lb cab-over truck at 55 mph into an interstate flow of 80,000 lb semis running at 70 and the mismatch is not about the top speed. It is about everything else.
The legal part
Importing a 25-year-old kei truck is legal in all fifty states. Registering one for road use is a separate question, decided state by state, and the answers vary more than people expect. Some states title and plate them without fuss. Several that allow them restrict them — to roads under a posted speed limit, off interstates, or with slow-moving-vehicle requirements attached. Some refuse road registration altogether, and that includes New York, where this business is based. We sell trucks we cannot put on our own roads.
So we will not tell you a kei truck is street legal in the USA, because for a meaningful number of buyers it is not. What we will tell you is where to check: our state-by-state guide covers the current position and the questions worth asking your DMV, and it is the page we keep up to date rather than scattering state claims through the blog.
If your use case needs an interstate, settle the legal question before the mechanical one. If it does not, the legal question may not matter at all — a truck used entirely on private land is a different conversation.
What they are genuinely good at
Between about 25 and 45 mph, a kei truck is one of the most useful vehicles ever built. It turns inside almost anything, fits through gates and between rows, carries a standard pallet at hip height with the sides dropped, and costs very little to run. Farms, orchards, vineyards, nurseries, campuses, resorts, construction sites, warehouses, large properties: that is the whole design brief, and it is met completely.
Above about 55 mph it is a small, light, old vehicle doing something it was not built for. No configuration fixes that, and anyone selling you a kei truck as a highway vehicle is selling you the wrong thing.
If you still want the fastest one we have
Tell us the roads and we will be straight with you about whether this is the vehicle. If it is, the trucks to look at are the later 2WD five-speeds rather than the early four-speed 4WDs — get in touch, browse the kei truck inventory, or compare platforms in the model guide. Every vehicle we sell includes free insured door-to-door delivery anywhere in the continental USA.