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                        Technical
 Complete Manufacturer List  | KTM 640 LC4 Adventure  | 
| . | 
| Make Model | KTM 640 LC4 Adventure | 
| Year | 2006 - 07 | 
| Engine | Four stroke, single Cylinder. SOHC, 4 Valve per cylinder | 
| Capacity | 624.6 cc / 38.1 cu in | 
| Bore x Stroke | 101 x 78 mm | 
| Compression Ratio | 11.0:1 | 
| Cooling System | Liquid cooled | 
| Induction | Mikuni BST 40 | 
| Ignition | Contactless DC-CDI ignition with digital advanced system, KOKUSAN | 
| Spark Plug | NGK DPR8 EA-9 | 
| Battery | 12V 8Ah, maintenance free | 
| Starting | Kick & electric | 
| Max Power | 35.7 kW / 49 hp @ 7500 rpm | 
| Max Torque | 52 Nm / 5.3 kgf-m / 38.4 lb-ft @ 5500 rpm | 
| Clutch | Wet, multiplate | 
| Transmission | 5 Speed, claw shifted | 
| Primary Drive Ratio | 30:81 | 
| Gear Ratios | 1st 14:35 / 2nd 15:24 / 3rd 18:21 / 4th 20:19 / 5th 22:18 | 
| Final Drive Ratio | 16:40 | 
| Final Drive | Chain | 
| Frame | Central chrome-moly-steel frame | 
| Front Suspension | 50 mm WP upside-down forks | 
| Front Wheel Travel | 300 mm / 11.8 in | 
| Rear Suspension | WP monoshock | 
| Rear Wheel Travel | 320 mm / 12.6 in | 
| Front Brakes | 2X 300mm sisc | 
| Rear Brakes | Single 220mm disc, 1 piston floating caliper | 
| Front Tyre | 90/90 - 21 54S Enduro 3 | 
| Rear Tyre | 140/80 - 18 70R Enduro 3 | 
| Steering Head Angle | 62.5o | 
| Wheelbase | 1510 mm / 59.4 in | 
| Ground Clearance | 320 mm / 12.6 in | 
| Seat Height | 945 mm / 37.2 in | 
| Dry Weight | 158.0 kg / 348.3 lbs | 
| Fuel Capacity | 28 Litres / 7.4 US gal / 6.2 Imp gal | 
| Fuel Reserve | 3.8 Litres / 1.0 US gal / 0.8 Imp gal | 
	
The 640 Adventure presented by KTM retains 
    only the good features such as versatility, agility, power and gets reed of 
    the unnecessarily weight and size, resulting in an easy to ride all around 
    motorcycle with plenty of power coming from the LC4 single-cylinder engine 
    which proved successful on many KTM models (the Duke, SMC, LC4). 
    		
    
    Putting the bike
    into first gear
    doesn’t involve 
			
    any fatigue and
    the clutch feel
    is firm and
    precise. Having 
			
    ridden KTM bikes
    fitted with the
    same engine, I
    was now expecting
    a quick go
    coming from 
			the
    single-cylinder, but
    I must say
    that throttle 
			
    response, although immediate,
    was tuned towards
    trail riding 
			so
    it is a
    bit smoother 
			and
    reassuring.
    		
    
    The engine is
    enough powerful 
			
    for almost anything
    that the off-road
    will require: 
			
    climbing steep hills,
    passing through 
			
    rivers, and spreading
    dirt. You name
    it and the
    52 horses at
    7000 rpm will
    deal with, 
    problems excluded. It
    will also be
    the result of
    a torquey engine
    (55 Nm at
    5500 rpm) which
    provides all 
			of
    the tractable 
			
    power that gets
    you out of
    trouble and 
			very
    often impresses 
			
    your buddies. I
    had no problems
    taking the 640
    Adventure in 
			deep
    mud and then
    wash it as
    I passed the
    river (my feet
    were already 
			wet
    and the boots
    needed to be
    cleaned anyway, 
			
    so what better
    method?.
    
    Also out on
    the trails I
    managed to get
    the front wheel
    off the ground
    by suddenly 
			
    twisting the throttle
    and it was
    quite a pleasure
    to do this
    as the terrain
    ahead presented 
			
    many step-like bumps.
    Impressive pull 
			
    saves the day!
    
    But this type
    of exploitation 
			
    also requires good-performing
    suspensions and 
			
    the WP front
    and rear units
    are more than
    suitable for 
			the
    job. I did
    not manage to
    reach the fork’s
    bottom end more
    than two times
    and that happened
    while landing 
			
    from an ambitious
    and optimistic 
			
    jump above a
    thick log.
    
    The front brake
    played a trick
    on me (or
    I may have
    played a trick
    on the front
    brake) on wet
    grass surface, 
			
    determining the front
    wheel to slip
    and the rider
    to taste some
    muddy grass. 
			It
    is more of
    a talent thing
    than efficiency 
			
    as you have
    to calculate 
			how
    much to pull
    the lever, taking
    in consideration 
			
    the fork compression
    and the grip
    of the surface
    you’re on. I
    guess that this
    is why I’ve
    never seen an
    off-road rider 
			
    with no broken
    bones. On normal,
    street use, 
			the
    performance Brembo
    brakes which 
			
    apply their pistons
    on two 300mm
    discs up front
    and a single
    220mm disc at
    the rear prove
    very efficient 
			
    and confident-inspiring. I
    preferred using 
			
    both brakes because
    I didn’t wanted
    to taste the
    asphalt (I reckon
    that this ride
    report would 
			have
    been published 
			
    pretty late). Even
    so, it is
    steady and 
    confident under powerful
    braking.
    
    I’ve taken the
    bike down the
    freeway and 
			up
    to 80mph so
    I would get
    a feel of
    those harsh 
			
    vibrations that tend
    to make customers
    avoid it and
    I must say
    that evolution 
			
    has clearly said
    its word and
    even though 
			
    present through the
    handlebars and 
			
    footpegs, the vibration
    levels are 
    acceptable and easy
    to live with.
    Would you 
    preferred the engine’s
    grunt to fade
    away concomitant 
			
    to the rpm 
			
    increase? I don’t
    think so.
 
Conclusion
A wonderful mix of power, versatility and fun is what makes the 640 Adventure Traveller’s Edition a true blast each time you ride it. Prepared for the long run on and especially off the road, the bike is a true representation of KTM’s dedication on delivering the best performing and one of the most agile all-around motorcycles on the market today.
| Any corrections or more information on these motorcycles will be kindly appreciated. |