What is it?
The duke is a single cylinder road motorcycle, similar to a supermoto only with taller gearing and stiffer more road orientated suspension. This particular duke is a late 2006 limited edition in orange and black that retailed for £5995 when new, though I brought it in early 2009 for £2800 with 1400 miles on the clock.

Why I brought it.
Well my first true motorcycle was a 1990 Honda mtx 125 which I used day-in day-out and despite the winter salt and infrequent washes it displayed very little rust and never broke down, so when I decided to buy a cheep/fun commuter bike I looked in the direction of Honda and brought a FX650 however it soon became apparent that this bike didn't possess half the build quality of the mtx so when I came across this ktm I found myself admiring the thick painted plastics and deeply powder coated frame, In fact I'm still to find a poorly finished component on the bike I also I found the idea of a six grand bike for £2800 hard to resist.

Handling and ride,
Firstly the handling is amazing, ktm set up the suspension for a 75kg rider so I've had to beef up it up to suit my 87kg frame but I honestly don't know how they've made it handle so well the ride is soft enough to keep the wheels in contact with the road yet stiff enough to prevent a woolly ride, honestly the levels of grip are so great that you'd have to be really unlucky/daft to bin it and although ultimately a dedicated sports bike will deal with very fast corners better the duke will embarrass all other categories of bikes on the potholed and diesel covered roads of the UK and swerving maneuvers are a doddle due to the low weight and wide bars the only downside is that the feedback received through the bars is quite subtle because unlike a sports bike your not supporting your body weight with your wrists.

Performance,
Well no one really knows if the duke is a fast or a slow bike it depends who you ask (just try reading the forums) but in my experience it's quite exhilarating accelerating form 0 to 90 mph and its caught me out a few times when accelerating to 70 mph onto a fast flowing road only to look down and realise that your doing well over the speed limit and the inevitable embarrassment of having to slow down to 70. I'm not sure what the top speed is because I like to keep to the speed limit but from what I've been told and read it's about 115mph and that sound perfectly feasible to me, wind blast and neck strength will ultimately be the deciding factor then it comes to cruising speed but I find anything upto 80 comfy for about 60 miles.

Practicality,
The riding position is comfortable and the saddle although hard is well shaped and good enough for about 100miles, my father recently had to be airlifted to hospital in Coventry about 55 miles from his home in Northants where he remained for 8 weeks but the trusty ktm was good enough for the 110mile round trip every other day during his stay, it could just about travel the distance on one tank of fuel without resorting to using reserve and although it wasn't designed for motorway work it transported me in comfort and maintained a constant 70mph with plenty of power for easy overtaking .

Running costs,
Well its ok but not brilliant. The fuel economy is excellent at about 55 to 65mpg, I recently rode 55 miles from Coventry to Rushden along predominately fast motorway and dual carriage ways and it still returned 49 mpg. The cost of servicing it is very reasonable because ktm parts are cheep and the bikes simple enough to be serviced by anyone with a little common sense also the road tax is currently about £60 which although cheep it's nearly double the cost of my car's at £35, insuring the bike is quite cheep considering I'm aged 22 and a bloke however running costs go up when you factor in oil and filter changes every 3100 miles although even though there's two oil filter there both cheep as is the air filter and single sparkplug but the oil must be 100% synthetic. The bike does eat chain's and sprockets but replacement is easy enough to do yourself and a good quality X-ring chain if well lubricated/cleaned will cost £70 and last 5000 miles unfortunately rear tyres wear out at about the same rate so unless you own your own wheel balancing machine you'll have to fork out for a garage to do the work for you.

Dislikes,
My only criticisms is that my 19 year old 125 had a temperature gauge but my ktm only has a warning light which is a real shame and it takes a while (5min) for the engine to reach the optimum operating temperature.

Advice for owners,
Always drain the carburettor after each wash (it's easy, you just need a jar and a suitable screwdriver), I thought the manual was being overly precautious but I did once find water in the fuel after only a lite wash (never use a power washer).
When tensioning a chain try to balance all your weight on the left peg by kneeling on it and make sure you can only just get the chain to touch to top of the swing arm about a quarter of the way along.
Don't leave the bike idling to get it upto temperature as the vibration at idol will put unnecessary stress on the chassis, instead just ride the bike gently for the first few minuets.
Follow the service schedule.

I have owned a KTM 640 Supermoto for over 6 years now & would perhaps only swap it for a 990 Superduke. This bike really comes into its own on twisty, bumpy & gravelly B roads which are are a bit of a nightmare on a sportsbike. Perhaps more importantly you have the most fun on roads that are not infested with speed cameras!

The KTM LC4 640 is a fantastic bike, easy to maintain, quick acceleration, great fun on B roads, can't beat dropping it sideways in corners, wouldn't change it for anything.

The KTM LC4 640 is a great looking bike, makes riding fast, easy and cheap. The parts are easy to work on and I just can't keep off it. It's great fun for the B roads twisty lanes (not as much fun on the motorways) and not much keeps up with it.