Question about 2008 kawasaki Ninja 250R

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Different speed at the same RPM in 6 gear

Good afternoon.

I have a Kawasaki Ninja 250R 2008 that I bought in TeemGreen (An official dealer in Santiago from Chile Sud America) three months ago (Now have 1500 Km.). The Motorcycle have a problem. Early in the morning when the Temperature is cold the motorcycle perform very good with full performance, but when ambient temperature is with more heat, to obtain the same 100 Km/H in the same gear, the engine should put out 1000 additional RPM to get the same speed.

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  • cgandolf Nov 21, 2008

    other comment : After I washed the Ninja last weekend, I begin to hear a sharp noise that begin past to 30 km/h.

  • cgandolf Nov 21, 2008

    RPM and Speed have differences. In the morning (Cold) the ninja performs very well but at 14:00 hrs (Hot Temperature), the ninja take 1000 RPM more to get 100 Km/H.

    Another thing : I change de relations from 14/45 to 15/39. With this change the Ninja get 100 Km/H at 6000 RPM. Lose aceleration but get speed.


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There are a couple of possible solutions here: The first is that your clutch may be slipping when the engine gets warm. The second is that either the speedometer may be reading a lower speed once warm or the tachometer may be reading a higher RPM once warm.

IF the clutch is working properly and not slipping the speed of the rear wheel will always remain constant to the speed if the engine - the gear ratios will not change. If the clutch begins to slip it is possible for the engine to rev higher while the rear wheel speed remains the same. Your engine RPM and speed should always be "lock step" with one another when in any gear. To check if the clutch is slipping open the throttle when riding in high gear. The engine speed and motorcycle speed should increase together. If the RPM's rise quickly with no increase in speed this is almost a certain indication of clutch slippage.

Posted on Nov 21, 2008

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Hmmm, check to see if the brakes, or something in the drivetrain (i.e. chain, sprockets, wheel bearings), are binding slightly when it gots hot out. I have seen brakes bind or hang when warm out due to improper adjustment or air in the lines. Check to make sure you have proper freeplay at both brake levers(front and rear). Make sure that the clutch lever has proper freeplay also, and if it is hydraulic, make sre it has no air in lines.

Posted on Nov 21, 2008

  • Gagg Green
    Gagg Green Nov 21, 2008

    The more I think about this issue, the more it doesn't make sense. You can disreguard my last post. Correct me if I'm wrong, but, Engine RPM and vehicle Speed are directly related, Only afffected by gear ratios. If engine performance was the culprit, it would only be noticed by having to use more throttle. The final drive ratio of RPM:Speed does not change. This is only true of manual transmissions with a clutch. Which brings me to this... it seems that the only way for the actual "RPM" to be higher at a given Speed is for the clutch to be slipping. Maybe I am misunderstanding the original question, but, RPM and Speed are linked. Just Food for thought...

  • Gagg Green
    Gagg Green Nov 21, 2008

    Correct, you changed gear ratio and it changed your speed at a certain rpm. That is the only thing that would affect that. So it sounds to me like your clutch may be slipping when it gets hot. Are you just going by what the Tachometer says? Maybe your Tachometer is screwing up when it gets hot. It would be normal for you to have to open the throttle more to achieve the same speed, but the RPM would be the same. Sorry if it is hard to understand, its hard to explain.


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Offhand, it is not a problem. The operational factor would be the air temperature which affects air density. Temperature is (loosely) inversely proportional to the density. When the air is cold it is more dense. The air/fuel mixture is affected. In effect, you are running a richer mixture hence you get more power output at a certain RPM at lower temperature. When the air temperature goes up, the density goes down and the air//fuel mixture is as it should be and your bike produces a little less horsepower in the same RPM comparatively. To my knowledge, if your 250R is a US version, then this would be so because it is using dual Keihin CVK30 carburetors which does not take into account air temperature nor density.

On the other hand, the European and Asian versions are fuel injected and has air temperature sensors that compensate for similar instances. If you have this version, then it would require cleaning of the said sensors or direct replacement. Normally, this should still be covered by the warranty.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 21, 2008

  • Louie  Role
    Louie Role Nov 21, 2008

    On your postback/comment, I would be difficult even to venture a guess. On my ZZR, normal source of "unwanted noise" would be the instrumentation when the assembly slips out of its rubber mount or a link in the chain especially after a wash.


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