I had one a few years ago. the 625 SMC is the best incarnation of all the LC4s, a good compromise between the hooligan 660 and the 640LC4. The tank is smaller, but the airbox is bigger, and you get some of the engine internals from the 660. Mine made a genuine 61 RWBHP when set up at HMRacing in Kent.
(Don't be tempted by a 660. They are cool - and often cheap - but kickstart-only sucks on a cold day - and the engines are bored out to the limit, so they brake down a lot. Not having a proper ignition isn't exactly a 'security feature' either. Many have been raced too)
Make sure the previous owner was anal about what oil he used and how often he topped it up. Issues with Head castings (cracks between the valve stems), plus the clutch bearing were resolved by 2006, but they still drink oil (like all KTMs). Head race bearings take a beating as they are wheelie machines (2nd gear, 25mph, dip and crack - yeeha). Oil starvation is rare - unless you are a wheelie god and keep it on the back wheel for half a mile.
You will want an aftermarket pipe or at least endcans.... Akra full Ti systems are rare, but do come up S/H. Used to be around £700 so may be less now.
The one you've pictured is th newer twin pipe - which has a smidge more midrange, and prettier rear end, but a harder seat. I liked my old single-sider better, as the seat was so much nicer. My cousin (Usagi on the KTM Forum) still has his twin piper and he rides it every day all year round, commuting in London, or even for trips out to his parents in the back of beyond countryside. He'd come out with me and the Superdukers on trips to Finchingfield and been able to keep up fine. IIRC he even did London to Birmingham for the NEC a few winters ago. Get one.
Decent rear tyres will last 1000miles max. Avoid the sexy looking Goldspeeds as they cause a speed wobble (aka deathweave) above 70mph due to the shrp profile. I likes running an Avon Pro Extreme Rain front matched with a BT92 rear. Mutants would be a good choice too.
No idea about prices these days, but even if it's a low mileage minter then surely it would be well under 2750 private?
I miss mine...
