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Discussion Starter #1
YouTube channel MotoTop has a nice collection of top speed run videos with stock motorcycles, including the 2019 Ninja 1000 (Z1000SX), Versys 1000 SE, Z900RS, and more. Although the bikes' speedometer readings are visible he uses GPS measurements for the official top speed, and the delta between these indications is worth noting. He gets 248km/h (154mph) from the Ninja 1000, where the rev limiter actuates- repeatedly. Also impressive is the Z900RS, which pulls 229km/h (142mph). Versys SE is dragging the proverbial piano at 219kmh, and not looking all that stable either!

Note the 2019 Z1000SX LCD dash has dark numbers on light background:

 

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Wow!! That looks like fun. I run out of nerve around 110 mph unless I am on the track.
 

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The bike appears to be easily capable of pulling 6th gear beyond the rev limiter. So it would seem it can achieve top speed BELOW the 125 rwhp peak. Interesting.
 

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Discussion Starter #4
Typically a 190/55 rear tire raises overall gearing by ~3%, in theory making 158mph the calculated rev-limited top speed. That's if the motor would pull it: this 4mph increase requires ~8% more horsepower.
 

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Before any modifications I called it bouncing off the rev limiter as you would hit it hard enough to loose speed as seen in the video. After installing a S21, 190 55... at 3000 feet of elevation I could still bump the rev limiter but it was very gentle and would only loose maybe 1mph. After ivan's and the additional 500 rpm of course top speed increased on the dash and although it indacted the new rev limit was being reached I could never really feel it, or hear it.
I've played with a 200 55 and stock gearing, which gave me my best top speed, but now run a 17 41 back on 190 55 which nets me a 166 indacted and GPS reading of 164 at 10200 rpm. So obviously at this point I'm power limited and would have to drop a tooth on the front or maybe two on the rear to gain back some rpm back.
 
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