Secondly, have you tried riding any other RTR (clocked under 5K km) in a similar manner? Since you're saying that it does 100+ easily in 5th gear, I'm guessing that there isn't anything abnormal.
If I recall, my bike was a lot less free revving/smoother in the lower gears in its early days than it is now. As the engine started clocking more and more, and I started revving it more and more to higher RPMs in the lower gear, it started to get better.
Anyway, check the oil first and report back.





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