Can I fit handle bar raisers to the the new KTM RC390?

If you have shifted from a commuter bike to a sporty bike then you might be experiencing pain and stretch in the wrists. And may be that's why you have come up with this question. But don't worry the pain will ease away within few weeks as you will get used to aggressive riding posture. Avoid tight gripping of the bike. And if this doesn't help the you can go for handle bar raisers. You would need adapters machined with a taper and a few bolt holes to fit them along the bars.