2024 · Enduro · Buyer's Guide
Two-Stroke Fuel Injection Done Right
This is a 249 cc two-stroke single built around throttle body injection, and the fueling is what defines the whole machine. Power lands at 50 hp with 27 lb-ft behind it, but the number that matters is how early the drive arrives and how cleanly it keeps coming. The chassis is shared with KTM's motocross side, which shows up as a bike that changes line under you almost before you've decided to. WP suspension front and rear is adjustable without tools, and the range in it is real, not decorative. Off-road, this thing has no soft edges.
In technical terrain it's exceptional. Steep, loose, rocky ground where a heavier bike would be pushing you around is exactly where the 250 EXC feels calm, and 11.8 in of front travel with 12.2 in at the rear soaks up the kind of hit that ends other days early. The honest part: seat height is 37.8 in, fuel capacity is 2.4 gal, and the TBI electronics add complexity a two-stroke never used to carry. The auto-adjusting power valve can go erratic after a hard over-rev, and the wiring loom deserves attention if you ride wet and muddy. This is a serious rider's bike, not a first one.
Spec sheets don't ride bikes, but they set the baseline.
| Power | 50 hp (37 kW) |
|---|---|
| Torque | 27 lb-ft (36 Nm) |
| Displacement | 249 cc |
| Engine | Single-cylinder |
| Cooling | Liquid-cooled |
| Gearbox | 6-speed |
| Final drive | Chain |
| Fork | Upside-down (USD) |
| Front tire | 90/90-21 |
| Rear tire | 140/80-18 |
| Ground clearance | 13.7 in (347 mm) |
| Front travel | 11.8 in (300 mm) |
| Rear travel | 12.2 in (310 mm) |
| Seat height | 37.8 in (960 mm) |
| Fuel capacity | 2.4 gal (9 L) |
Equipment check
Chassis
This part isn't my own test ride. It's what I've gathered over years of paddock conversations, trailhead talk with owners, club nights, and the messages riders send me directly. For the 250 EXC TBI the chatter is unusually consistent: heavy agreement on how it behaves low down, with a narrower set of complaints about the top end and the price.
Low-speed drive is what riders talk about first. Owners coming off the TPI bike consistently describe stronger bottom-end pull, and say technical climbs and slow, awkward sections take less work than they used to. Almost as often, riders call it lighter and easier to flick around in tight woods than the 300. Consistency comes up too: owners say it picks up the same way cold or high up. A few single out a clutch light enough to keep forearms fresh late in a hard day.
The complaints are fewer and narrower. Riders note the power tails off in the upper rev range, so they shift more often to stay in the strong part of the delivery. The other recurring remark is what it costs: owners place it at the top of the two-stroke enduro market, above what most rivals ask.
Piston blow-by on sibling 300 TBI
Reports of piston blow-by at low hours (20h) on the 300 TBI counterpart; potential risk for the 250 due to shared engine architecture.
Electrical wiring harness durability
Fragile wiring loom and complex TBI electronics raise concerns about long-term reliability in wet/muddy conditions.
Erratic auto-adjusting power valve
The ECU-controlled power valve can behave erratically, particularly after over-revving, causing inconsistent power delivery.
Suspension internals may need upgrading
Stock suspension still leaves room for improvement; re-valving or aftermarket components often required for aggressive enduro riding.
Where this KTM 250 EXC TBI pulls ahead of — or falls behind — its rivals on the numbers, and the typical bike in its class on character.
Power
Torque
Displacement
Seat height
Forget spec-sheet bragging. Here's who the 250 EXC TBI is actually built for.
This is your bike. On slickrock, sand, and the technical lines that punish weight, the 250 EXC is light enough to place anywhere. Just plan around the 2.4 gal tank on long days.
Made for Bar M / Kane Creek · Imperial Sand Dunes · Johnson Valley OHV Area
The motocross-derived chassis and track capability are absolutely there, and it will hold its own on a circuit. It is tuned for traction and drive, though, not for a start gate.
Made for Carnegie State Vehicular Recreation Area · Fox Raceway at Pala · Glen Helen Raceway
It will out-ride anything you own on the hard sections, but 2.4 gal of fuel and a 37.8 in seat make multi-day BDR logistics a fight. Wrong tool for the mission.
Made for AZBDR — Arizona Backcountry Discovery Route · California BDR South · COBDR — Colorado Backcountry Discovery Route
If you're cross-shopping the older generation, here's what changed.
Previous generation · 2023–2025
The Six Days Two-Stroke Racer
Compare to the previous model →If this one isn't quite the fit, these are the bikes worth riding back-to-back against it.
