Picked up this one yesterday for Ba. She is chuffed as ... as that guy that got pushed in front of the Steam Loco
The poor girl can’t even properly balance a tricycle. 
Definitely a grey (second hand import) model, believed to be around a 2002 model according to the previous owner. Paid 10k.
I’m not technical and have noticed the following compared to the previous posts:
• It’s a. DR250S as mentioned by Sidetrack. What is difference between R and S or for that matter al of them?
• Height Control. Is this only to compensate for short to tall riders or is there other logic?
• Upside down fork (other technical name please?) which is not shown previously. Could this be a mod? And what is the logic again?
• What oil filler is in front of the petrol tank?
• According to previous owner it at least reaches 100km/h. Surely it should do more? Maybe in need of a major service and what mods would improve performance?
• Have I paid too much for the 21k kilometers done?
Haven’t done any other inspections yet except when taking him (its going to be a girl’s bike) home, I note the short gear ratios and maybe a bit sluggish. On other hand I’m used to a 650.
Your age estimate is a tad off. Your bike is more likely a 1990 model

This one:
DR250S Probably a 2002 second hand import. Which in beautiful SA makes it a 2002 model

I don't know too much about the DR250.
It started off in 1982 with the DR250S and went with little change on until 1994 or 1995. 1990 saw the introduction of the DR250SE. In other Suzuki DR's the addition SE (second edition?) marked the change to SCEM cylinders (DR650SE and DR200SE both introduced in 1996). I think and stand to be corrected the DR250SE marked the introduction of the electric starter.

The 1990 DR250SE is the only one I could find pictiure references for the upside down forks. (Yes, they were OEM)
The further line of development spat out three mostly unrelated DR250 (to the early DR250S / SE) models in either 1995 or 1996: The DR250RS, DRZ250 and Djebel250XC. Only the DjebelXC is reasonably common in South Africa a but also only as a grey import.
The later DR250RS / DRZ250 / Djebel250XC have a completely different air / oil cooled DOHC engine similar in basic design to the water cooled DRZ400. See pics supplied by Watty.
The ride height adjustment was only available in the USD fork variant

and it was an optional extra

. These two statements are very vague based on what I remember about bikes I had not any interest in and diluted by all the beers of the last 20 years

And yes it's designed for shorties

As far as I remember the variable ride height was also only available in certain countries (Germany being one of them). The idea was to get girls into riding a DS bike. At that time all the tough cookies were used to the tall bikes already

The oil filler cap in front of your petrol tank is for your engine oil. It has the oil dipstick attached to it. If there's no oil in there your engine is kaputt! This system is commonly referred to as
dry sumpThe bike should cruise happily at about 100 and get up to 120 or so. One source on the web
hereclaims 135km/h which I think is not realistic for a 16kW bike unless you ride down a mine shaft (or down Sir Lewry's Pass in a howling Southeaster which gives you similar results

)
If the price is justified will depend entirely on the bikes condition. R10k is not much for a good & reliable bike but 20 years is quite something for a bike.