KTM 640 SUPERMOTO (1998 - 2007) Review

At a glance

Owners' reliability rating: 3.6 out of 5 (3.6/5)
Power: 53 bhp
Seat height: Tall (35.8 in / 910 mm)
Weight: Low (329 lbs / 149 kg)

Overall rating

Next up: Ride & brakes
4 out of 5 (4/5)

The KTM LC4 640 is KTM’s popular supermoto stalwart – a rough, tough bugger that’s a capable commuter, trackday sleeper and friend to the wannabe stunt monkey. It sits on the civilized side of the LC4 family, benefiting from an anti-vibe damper, and an electric start to complement the kicker. Like all supermotos it’s as cheap as chips, geared for giggles and ready to rumble.

Ride quality & brakes

Next up: Engine
3 out of 5 (3/5)

Providing it’s not still sitting on the dreadful Pirelli MT60 tyres it comes with the KTM 640 LC4 Supermoto handles sharply. The fully-adjustable WP suspension and four-piston Brembo brakes mean confident stopping is just a two-finger tug away. The seat is narrow to let you climb over the bike for faster cornering, but you’ll be thankful for the small tank and the chance to get off after just 70-odd miles.


Next up: Reliability
4 out of 5 (4/5)

This KTM 640 LC4 Supermoto's liquid-cooled, SOHC single-cylinder motor has been in KTMs for over a decade, and in the 640 it’s definitely as its most civilised. But if you’re new to the world of supermoto you’ll probably think it rough and vibey. They’re all like that, Sir. Unlike the spunkier SMC range, which flat-slide carbs, the 640 gets a 40mm CV item for a more user-friendly response, especially around town.

Reliability & build quality

Next up: Value
4 out of 5 (4/5)

The KTM 640 LC4 motor is extremely reliable, providing it’s serviced regularly. Every 3000 miles there are two oil filters to change, but that’s a 30-minute job. Change the oil, too – that takes about another 20 minutes, but those chores will keep the motor perkier for much longer. Adjusting the valve clearances is easy thanks to a simple screw and nut arrangement. Keep the 640 away from salted roads – or else it corrodes like hell.

Value vs rivals

Next up: Equipment
4 out of 5 (4/5)

The KTM 640 LC4 Supermoto is very good to buy, rubbish to sell. Supermotos are a poor monetary investment. Find a KTM 640 Supermoto for sale.


3 out of 5 (3/5)

Apart from top names like Brembo and WP which adorn the stock machine the aftermarket offers a virtually unlimited opportunity to screw every last ounce of power from your KTM 640 LC4 Supermoto. A rear wheel dyno figure of 60bhp is well within reach.


Engine size 625cc
Engine type 4v single, 5 gears
Frame type Tubular steel cradle
Fuel capacity 9 litres
Seat height 910mm
Bike weight 149kg
Front suspension Preload, compression, rebound
Rear suspension Preload, compression, rebound
Front brake Single 320mm disc
Rear brake 220mm disc
Front tyre size 110/90 x 17
Rear tyre size 160/60 x 17

Mpg, costs & insurance

Average fuel consumption 42 mpg
Annual road tax £93
Annual service cost -
New price -
Used price -
Insurance group 11 of 17
How much to insure?
Warranty term -

Top speed & performance

Max power 53 bhp
Max torque 41 ft-lb
Top speed 110 mph
1/4 mile acceleration 14.7 secs
Tank range 80 miles

Model history & versions

Model history

1998: Model released.
2005: Gets a twin pipe exhaust.
2007: KTM 640 LC4 Supermoto deleted.


Other versions

KTM 660 SMC: No e-start, vibes aplenty, huge power, lighter weight, much shorter service intervals. Huge fun.

Owners' reviews for the KTM 640 SUPERMOTO (1998 - 2007)

5 owners have reviewed their KTM 640 SUPERMOTO (1998 - 2007) and rated it in a number of areas. Read what they have to say and what they like and dislike about the bike below.

Review your KTM 640 SUPERMOTO (1998 - 2007)

Summary of owners' reviews

Overall rating: 3.8 out of 5 (3.8/5)
Ride quality & brakes: 4.6 out of 5 (4.6/5)
Engine: 3.8 out of 5 (3.8/5)
Reliability & build quality: 3.6 out of 5 (3.6/5)
Value vs rivals: 3.6 out of 5 (3.6/5)
Equipment: 3.2 out of 5 (3.2/5)
5 out of 5 Total unadulterated fun
29 November 2011 by mattski34

One word..........BRRRAAAARRRP!!!

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 5 out of 5
Value vs rivals 4 out of 5
Equipment 5 out of 5
11 October 2008 by dparky

I have wanted one of these for a couple of years now, and now that I finally got one I have to say I am not in the least bit disappointed. Incredible road holding, top gear roll on from 60 to 90 is a rush of grunt that bikes 3 times the cost would be proud of. Keep it serviced with fresh oil and filters, wash it like its your baby and it repays you with grin factor a-plenty. The seat is a razor blade, but a comfort version is available for peanuts, as is the rest of the parts and accessories for these bikes, so turning it into a comfortable mode of transport is easy. Think of it as a bare bones, no un-nessessary clutter of a bike and enjoy biking at its most primal.

Ride quality & brakes 5 out of 5
Engine 5 out of 5
Reliability & build quality 4 out of 5
Value vs rivals 5 out of 5
Equipment 3 out of 5
4 out of 5 blaster
21 February 2008 by banzai boy

I bought the 2006 LC4 from Premier in Didcot, aftern a road test i had to have it.So easy to ride, loads of low end grunt and fun B road handing,Ilove the point and squirt fun & instant overtaking power.The bike is a HOOT.

Ride quality & brakes 4 out of 5
Engine 4 out of 5
Reliability & build quality 4 out of 5
Value vs rivals 4 out of 5
Equipment 3 out of 5
1 out of 5 2006 lc4
17 June 2007 by r-tune

Poor engine reliability for an engine which is supposed to be bullet proof.

Ride quality & brakes 4 out of 5
Engine 1 out of 5
Reliability & build quality 1 out of 5
Value vs rivals 1 out of 5
Equipment 2 out of 5
4 out of 5 2006 KTM 640 LC4 Motard
22 May 2007 by Phantom_Mark

Everything as said in this review. I bought mine from a main dealer in the midlands ( Gear4 - Market Deeping ) second hand, 1 owner from new FSH and 1700 Miles. My machine has the aftermarket Akropovic titaniums and airbox mod, jetted to suit. The only real negatives I would say about this bike are that the seat is rock hard, really sore ass after a day out and only 200 ish miles. Fuel tank is tiny, 100 miles to reserve, and the rideability around town is terrible sub 20mph in your typical urban traffic, very jerky, hard to be smooth. Aside from these gripes the handling and performance is just breathtaking to be honest, my last bike was a FZR1000 however :D

Ride quality & brakes 5 out of 5
Engine 4 out of 5
Reliability & build quality 4 out of 5
Value vs rivals 4 out of 5
Equipment 3 out of 5
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