How will the H2 SX compare to other bikes

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Re: How will the H2 SX compare to other bikes

Post by Ninja H2SX » Mon Dec 18, 2017 7:06 am


UFO wrote:
Sat Dec 16, 2017 1:45 am

Acceleration is a function of torque and mass.
Top speed is a function of horsepower and coefficient of drag.
To add, the obtainable max top speed for the bike's max HP output is also dependant on gearing. You'd want to gear it so the aerodymamically limited max top speed was obtained at the peak HP RPM in 6th gear.

As shown in the gearing spreadsheet link you have, the SX is geared to hit 185~186 MPH at redline in 6th gear. But I'm pretty sure it has enough RWHP to limit out aerodymamically closer to 195 MPH if it was geared ideally for top speed. Looks like Kawasaki geared the SX for a top speed of 186 to comply with the speed limiter agreements. Might mean it's not electronically speed limited if re-geared for more top end.

Are regular H2s speed limited? I see maniacs on YouTube hitting 200+ on H2s, but maybe they have reflashed the ECU or over rode the electronic limiter some other way if it has one. If H2s have one, then the SX might too, so re-gearing for more top speed would also need a limiter defeat.

But who even needs to go 186 on a "sport touring" bike. :eek: :D
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Re: How will the H2 SX compare to other bikes

Post by DeRox » Mon Dec 18, 2017 7:46 am


The H2 is speed limited. By gearing/rpm and the throttle valves just close partly above 10,000rpm in 6th...
I was such a maniac hitting 200mph (on gps). For that I had to change gearing and flash the ecu...

And indeed, 186mph should be enough on a tourer ;)
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Re: How will the H2 SX compare to other bikes

Post by UFO » Wed Dec 20, 2017 6:04 am


The only reason I would re-gear it would be to lower RPMs at cruising speed, and thus increase mileage. That would have the added benefit of potential higher top speed as well. :wtf:

Lower RPM at high speed is sometimes important out here in the great west. I've ridden through areas of WY, NV, and MT where you can see the road to the horizon and you meet a car about once an hour. Was very routine to cruise at 100-120.

Here's hoping the SX feels stable, planted, and composed at speed.
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Re: How will the H2 SX compare to other bikes

Post by JonTheChron » Thu Dec 21, 2017 1:19 am


The highest I've seen the bike go is 298KM/h (186.5MPH) @like 7.5k RPM, so lets assume it can hit the 200MPH stock
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Re: How will the H2 SX compare to other bikes

Post by Kilo_Rider » Thu Dec 21, 2017 5:03 am


Isn't that just the instruments in some kind of test mode for the bike shows, or is that from an actual video? :blank: :eek: That cant be right.
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Re: How will the H2 SX compare to other bikes

Post by Ninja H2SX » Thu Dec 21, 2017 7:33 am


Kilo_Rider wrote:
Thu Dec 21, 2017 5:03 am
Isn't that just the instruments in some kind of test mode for the bike shows, or is that from an actual video? :blank: :eek: That cant be right.
That speedo readout is probably in KMH, so 298 KMH is 185 MPH.
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Re: How will the H2 SX compare to other bikes

Post by DeRox » Thu Dec 21, 2017 7:49 am


My H2 hit 299kmh on the speedo when the gps indicated 275kmh... So there's a bit of exaggeration there...
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Re: How will the H2 SX compare to other bikes

Post by Ninja H2SX » Thu Dec 21, 2017 8:04 am


DeRox wrote:
Thu Dec 21, 2017 7:49 am
My H2 hit 299kmh on the speedo when the gps indicated 275kmh... So there's a bit of exaggeration there...
Speedos always seem to read at least 10% high on bikes.
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Re: How will the H2 SX compare to other bikes

Post by Kilo_Rider » Thu Dec 21, 2017 4:45 pm


Ninja H2SX wrote:
Thu Dec 21, 2017 7:33 am
Kilo_Rider wrote:
Thu Dec 21, 2017 5:03 am
Isn't that just the instruments in some kind of test mode for the bike shows, or is that from an actual video? :blank: :eek: That cant be right.
That speedo readout is probably in KMH, so 298 KMH is 185 MPH.
not at 7000 rpm
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Re: How will the H2 SX compare to other bikes

Post by cOoTeR » Thu Dec 21, 2017 10:04 pm


The Speedo tolerances often lean towards the safe side and are proportionate to speed because they are off by a certain percent. People often assume the speedo is off by X amount of mph (or kph) but in reality the faster you go the more mph it's going to be off. Almost every bike I've owned had read fast on the speedo, if it said I was going 55 often my actual speed was 53. As the tire wears this effects the speedometers reading because a worn tire will cover a shorter distance per rotation than a new tire.

But the picture of the display doesn't tell us much as far as the actual bikes performance, it is just a display mode showing the display. Not a video of the bike running full out. Assuming the bike will go that fast based solely on what the display reads is like assuming an 05 Honda Accord 4cyl will do 160 because the speedometer goes that high. According to the gearing calculations that were posted on this forum it should be limited by gearing at 184.6 mph I believe. That's assuming it has the power to push it that fast and the aerodynamics to let it go that fast. Considering the gearing estimates are right at 185mph (the unofficial gentlmans agree top speed the manufactures use) and the UK sales guy said in a video that in a straight line it's performance is equal to a zx10r I'd bet the 185mph is the top speed if not close to it.

Another exciting thing is that the top speed limit is right at 185 mph based on gearing so it might not have an electronic top speed limiter like other bikes.
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