Dear Sir/Mam, I own a Royal Enfield Himalayan BSIV and I weigh 110Kgs.

Dear Sir/Mam,
I own a Royal Enfield Himalayan BSIV and I weigh 110Kgs. Let me explain my problem; while testing for top speed: In third gear, it can go upto 100KPH at around 6500PRM (not the accelerator is fully engaged, still some cog left) and I changed to fourth; In fourth gear, it can went around 120KPH (not the accelerator is fully engaged, still some cog left) at around 6500RPM and I slotted into Fifth; But in fifth, with full throttle this time it is only spinning at 6100RPM and the top speed I did is around 125KPH! I did it several times; and I prolonged the period to attain the top speed, but the results were the same. But actually the top speed of the vehicle is 135-140KPH!
What is the problem? Bike or my weight?

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