the raised area on the sprocket would normally face inwards (towards engine) on DR models (it does on both the 650's Ive owned)
However if you do not have a damper the sprocket may sit out too far on the shaft and not be inline with the chain, which will not do the chain any good or the output shaft bearings long term.
I would get hold of a laser and line it up along the length of the chain (inline with the rear sprocket) and make sure the front sprocket is inline with everything, if not then try to get hold of damper or fabricate one or make up a spacer to keep everything inline.
The damper looks like it just sits between the retaining plate and sprocket and just eases the big gobs of torque the big thumper puts out.
You can buy one here:
Damper,sprocket Dr800 1990 (sl) 2751737400
I see from the schematic the DR has an oil seal retainer, make sure you have one fitted as without one they can spit the seals out and dump the oil all over the back tyre
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