Hi &
I bought a GT, only because it was the most convenient at the time. A GT has a centre stand, heated grips, hand guards and Suzuki pannier rails with a Suzuki top box and panniers. It does
not have crash bars or a bash plate or the alloy rear luggage rack that yours has.
If it is/was a GT then someone removed the Suzuki GT pannier rails, luggage rack and the top box and panniers. They also added a bash plate and engine bars.
If it wasn't a GT then someone possibly added the centre stand and heated grips (assuming there are heated grips.)
Best thing to do is to check the V5C, it will say what it is. GT and T (Touring) are different again. If it is a Touring then is is the same as a GT, but it doesn't have the pannier rails and panniers (just the GT rear luggage rack and Suzuki top box.) Your rear luggage rack isn't a Touring spec one though so either someone changed it to the standard alloy rack or they have the Touring bit wrong.
Regardless of what it is, you actually have one of the better "base" combinations on that bike that you can get. You don't really want the Suzuki top box and panniers, the panniers are a bit shitty. You can add Givi rails and boxes for much cheaper than Suzuki ones are and they are muuuuuuch better. You already have a centre stand, the crash bars, the bash plate and handguards and those are the things you want as a good start covered
I'd push the dealer to give you discount if it doesn't have heated grips and because it doesn't have the panniers and top box, simply because it was advertised as a GT/Touring and it's 'supposed' to come with the boxes.
Torque for the rear axle is 100Nm as per Suzuki's spec, reduce it ~10% if you use a lubricant (copper grease/grease/oil.) 20mm-30mm slack with the bike on the SIDE stand, measured in the middle between the front and rear sprocket and in the tightest spot. Rather err on the loose side than the tight side, a tight chain is a sure way to knacker it quickly, loose is the lesser evil.
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