Hi,
I had exactly the same problem on my 640 Adventure when I bought it. It was 2nd hand, but with only 800 miles and had just had it's 'running in' service. It would use a 'noticable' (in terms of the sight glass level) amount of oil after 150 miles. Anyway, I hunted around the manual and it mentioned in there to be careful of the oil viscosity (the engine needs 10w50 rather that the more common 10w40) or else it can use oil. So, I checked the receipt for the running in service and they'd put 10w40 in. I changed this for 10w50 and it hasn't used a drop in the last 1000 miles.
Hope this helps,
Cheers (and Happy New Year) - Andy B
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AndyBee
(04 KTM 640 Adv 'Naartjie'/11 KTM 990 Adv 'Tsumeb')
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