Question about 2003 kawasaki KX 250

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No power no power band

2003 kx250 i think the power valves are not opening. 1/2 to full throttle no power, has a deeper sound, then sometimes it works fine for a few minutes than back to the problem

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  • Anonymous Mar 26, 2009

    bottom end was rebuilt on kx250 afterwards no power and no power band. Does it just need a top end rebuild perhaps?

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  • 46 Answers

Hi,
I think your diagnosis is correct.
It sounds to me that the cenrifugal clutch is not working. This is the device that makes the power valve open and close.
It is situated behind the water pump, and is a non-service item.
It works in a similar way to the automatic clutch on a scooter
Enjoy your ride !
Jon

Posted on Mar 05, 2009

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Powerband


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A diesel engine has a specific rpm range it has to maintain under load to get nominal horses.. If everything is functioning at nominal, max power is put out. Surprisingly enough it can be felt in all engines if paid attention . That's all it is, no special "bands" or parts. Knowing where the power band(range is makes a big difference on any machine. On an electric motor peak torque is @ let's say 1850 rpms. go faster useless lower toyque. go slower power drops To keep the range of the power band constant. everythinhg needs to be constant, like fuel mix, spark plug condition ,air filter andcarb adjustments.. I had a bike I hate and feared the power band. I would fall into it not paying attenyion and it would litterally crawl out from under me. All it is is that narrow band of peak performance..

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Problem with the powerband on my kx250


sounds like you need a new power valve in the cylinder. They can go bad and thats how they will act. You have to take the cylinder off to change it. If your that far you might as well put a new piston and ring in it.

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