speed range per gear? - Page 2 - Honda CBR250R Forum : Honda CBR 250 Forums
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post #11 of 13 Old 04-20-2012, 11:23 PM
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I am also not one of those "going past 6,000 RPMs is bad for your bike" kind of people.
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post #12 of 13 Old 06-19-2012, 01:38 PM
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Physics Question

(modified quote)
Quote:
Originally Posted by roadster View Post
If you look at the graph attached to this post... (see below) ...you will see the true ( rather than indicated ) speed in each gear. It is not difficult to reach 10,000 in the lower gears but top gear will only pull to around peak power, which is 8,500 r.p.m.


I have the same issue. I can't get past peak power by accelerating in top gear alone. some people are claiming speeds well into the 90's. Would someone with knowledge of the subject care to clarify?

C'mon, sko sko sko!

Last edited by Rusty Shackleford; 06-22-2012 at 01:06 PM.
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post #13 of 13 Old 06-19-2012, 04:11 PM
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Can't say I necessarily have more knowledge, but just because you're past peak doesn't mean the engine suddenly stops making power, it just makes less power.

This is why, even though we "peak out" around 8500, some of us are able to get that up into the 9000's and even tickling 10,000. It will keep pulling, it just doesn't pull as hard.

Change the gearing, and all that changes, though. If you go too high, you'll not have enough torque to pull faster or your 1st gear will be too high to be efficient. Go too low and you'll end up with more amazing acceleration, but you will lose top speed.

IMHO, the gearing combo that comes from the factory is nearly spot on for general use. Some like sendler really want a change there because their motives and methods are a little different.

Sorry if I misunderstood the question.

cheers,
dj
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Motoring on two wheels since 1983

"This old engine has a nickels-and-dimes sound to it. As if there were a lot of loose change flying around inside. Sounds awful, but it's just normal valve clatter. Once you get used to that sound and learn to expect it, you automatically hear any difference. If you don't hear any, that's good." -- Zen and the Art of Motorcycle Maintenance
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