KTM 250 EXC-F Buyer's Guide

The Machine's Character

The heart of this one is the 250 SX-F motocross engine reworked for the woods: a DOHC liquid-cooled single fed by a Keihin carburetor, making 42 hp from 250 cc. What matters is where that power sits. It will pull from low revs without protest and still wind out when you ask, which is exactly the job description for an enduro motor. Around it, a chrome-moly steel frame, fully adjustable WP suspension with 11.8 in (300 mm) of front travel and 13.2 in (335 mm) at the rear, 15.2 in (385 mm) of clearance, six speeds and a chain. Nothing decorative. This is competition hardware with a plate.

It rewards a rider who already has skills to spend, and it wants discipline off the bike as much as on it. Warm it through properly and take care with the oil filter before you get aggressive, because the big end bearing is the part that pays for impatience. Watch for a small crack opening up in the cylinder head once things are hot. Expect stubborn starting, cold or hot, when the carburetion or ignition drifts out of tune. The 1.8 gal (7 L) tank keeps rides short by design. None of that disqualifies it. It just means this is a machine you maintain rather than one you ignore.

Hard Numbers

Spec sheets don't ride bikes, but they set the baseline.

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Key specifications
Power	42 hp (31 kW)
Displacement	250 cc
Engine	Single-cylinder
Cooling	Liquid-cooled
Gearbox	6-speed
Final drive	Chain
Fork	Upside-down (USD)
Ground clearance	15.2 in (385 mm)
Front travel	11.8 in (300 mm)
Rear travel	13.2 in (335 mm)
Fuel capacity	1.8 gal (7 L)

Equipment check

Chassis

Front Suspension Adjustable Standard
Rear Suspension Adjustable Standard

Known issues

Big end bearing failure risk

engine occasional

The big end bearing can fail if the oil filter is not properly soaked and the engine is not adequately warmed up before aggressive riding. This issue is raised by some owners and can lead to catastrophic engine damage.
Cylinder head cracking when warm

engine rare

A potential issue where the cylinder head develops a small crack that opens when the engine is warmed up, causing performance problems and possible coolant loss.
Hard starting and rough idling

fuel system occasional

Owners report difficulty starting the engine when cold or hot, sometimes accompanied by rough idling. This is often attributed to carburetion issues or ignition system faults.