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Help!!! Nsr sp 150 Rpm can't go above 5k

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Hi guys, my nsr sp 150 cannot go above 5k rpm, it was ok when I just start riding, it happened when I was 30 mins into my ride. I start having difficulty going above 5k rpm, no matter how much I throttle, it will just be stuck at 5k rpm and the bike jerks a lot when I am trying to throttle more to try to go above 5k rpm. No matter in which gear, it will nvr go above 5k rpm except neutral. What is the problem?

Edited by iAv3ng3r
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