Top speed problem - Honda CBR250R Forum : Honda CBR 250 Forums
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post #1 of 21 Old 05-29-2016, 04:27 PM Thread Starter
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Top speed problem

Hi guys I'm Kishan from India ,and a proud owner of cbr 250r
I wanted to know is there any difference between Indian model and Thai models. The reason am asking is my bike never crossed 8500 rpm and the speed which I get is 138 km/ h , max. . But on some blogs and on YouTube reviews it claimed top speed is 150km/ h . Can anyone shed some light on it.
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post #2 of 21 Old 05-29-2016, 06:06 PM
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Hi Kishan and welcome to the forum.
Your top speed sounds about right. That's what I'm getting without tucking in 6th gear.

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Last edited by Schroeder; 05-29-2016 at 06:46 PM.
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post #3 of 21 Old 05-29-2016, 06:41 PM
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8500 is about max hp for about 140kph..
in 6th [overdrive] your hp wont push past 8500..
[unless downslope or strong tailwind etc]..

generally going past max hp rpm effect is to
keep close to max power when rpm drops
after shifting gears [when rpm drops]..

best to ride her within her best rpm/hp range
when in a hurry, but to leave 5mins early
instead of chasing the clock with road speed..

gearing changes [eg up or down countershaft sprocket]
effect acceleration and top speed, depending..
stock gearing is for 'average' riders/conditions..

its a 250cc single tuned for economy etc,
so you cant expect miracles..
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post #4 of 21 Old 06-03-2016, 03:35 PM Thread Starter
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Thanks for replying but is there any way where I can improve top speed without any stock change's ,
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post #5 of 21 Old 06-03-2016, 03:54 PM
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Mine takes easily 150km/h, today I've tried in a little downhill and I've reached 167km/h, not bad for my body weight of 100 kg (I know it can help in downhill!! )
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post #6 of 21 Old 06-03-2016, 04:03 PM
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Quote:
Originally Posted by Kishan View Post
Thanks for replying but is there any way where I can improve top speed without any stock change's ,
You can shift down to 5th gear and try to get a bit faster that way and of course you can tuck.

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Originally Posted by Jean View Post
Mine takes easily 150km/h, today I've tried in a little downhill and I've reached 167km/h, not bad for my body weight of 100 kg (I know it can help in downhill!! )
I believe that the Indian CBR have a different engine management software that gives them slightly less power but more efficiency...or so I've read here once.....

My computer is fighting Aids and Cancer in it's idle time, and yours?
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post #7 of 21 Old 06-03-2016, 04:17 PM
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That may be about it.

Some things that will limit top speed are air temp and density, your size, and how you try to get there.

Best way, for almost all engines, is to run up to redline in each gear. You have the best acceleration curve and torque multiplication when in the lowest gear possible.

Some times, depending on gearing, you will lose speed when shifting into top gear because you are dropping back from the power peak and producing less power to overcome drag.

No matter what you do, the CBR isn't going to be fast. It was designed to produce power in the midrange, unlike the Kawasaki and Yamaha of a similar size. That's a good thing most of the time, but is going to limit its top speed potential.
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post #8 of 21 Old 06-07-2016, 02:55 PM Thread Starter
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Jean you are right, Indian model are remapped for better economy.. but still is there any way where I can get more juice out of it
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post #9 of 21 Old 06-08-2016, 09:24 AM
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Quote:
Originally Posted by Kishan View Post
Jean you are right, Indian model are remapped for better economy.. but still is there any way where I can get more juice out of it
It's not me but Schroeder who said this and I think he's right, but with mine I never exceed 4 liters/100 km and I find it correct because I use more high revs with the CBR than with my Tiger 800 who has a fuel consumption of one liter more
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post #10 of 21 Old 06-08-2016, 11:57 AM
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Quote:
Originally Posted by Kishan View Post
Jean you are right, Indian model are remapped for better economy.. but still is there any way where I can get more juice out of it
Buy a 300?

In all seriousness, it's a 250. Not much else to be done with it; it was designed to be practical and frugal, not fast and furious.
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Tis better to be thought a fool and remain silent, than to open one's mouth and remove all doubt.
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