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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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 !

Posted on Mar 05, 2009

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Hello, I hope you can help. I have a 2009 Kawaski kx250 four stroke. It is VERY hard to kick start and sometimes will not at all. Once it gets running it runs great but if I turn it off (even after it...

There is a proper way to start the engine. Four controls are on your bike to assist in starting. Below are generic instructions.

  • The choke, used when the engine is cold. Pull the red knob for choke.
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Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Now release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm, (Power valve), in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. A flooded engine will often backfire. Now give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from the kick lever. This happens in the case of a misfire, aka > backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), for six kicks. After six kicks go ahead and twist the throttle again for a second priming. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting. Note that not all carbs have a power valve. When a power valve is not present you should crack the throttle open only 1/8 inch from closed on each kick. Please rate my answer.

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Sounds like you're getting enough fuel (black smoke) Could be running on only one cylinder. Either stuck valve or loose valve adjustment or one bad magneto. You could try starting with one spark plug disconnected. If it doesn't start, reconnect that one and disconnect the other. IF it runs like it was, then you're running only one cylinder, and go to work on finding out why.

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First, fill the master cylinder to the full level with brake fluid. Locate the bleeder valve down on the caliper and get out a wrench that fits it. Then pump the pedal several times and hold it down as you open the bleeder valve. Do not let the pedal back up while the valve is open - or else air will be drawn back in. After a few seconds, close the valve and pump the pedal again.
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Jan 13, 2010 | 2003 kawasaki KX 250

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My 2002 kdx200 has just had new barrel and big end done. it got a pro curcuit exhust system when riding it goes well in power band but when i drop out of pwr band its like its still in but has no power...

The kips is a power valve.
It moved a little when excellerating to actually change the exhaust port timing as the engine revolutions get higher, to gain more power.
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is your gas tank clean ? ever drain the carb? should every season. check to see if you have correct spark plug and gap. check fuel line for crimp.

Oct 10, 2009 | 2003 kawasaki KX 250

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The power band is the point wheneverything is nominal and and peak performance is realized. The air/ fuel ratio , timing, rpms It's mor predominant and noticeable in a motorcycle because of handling and weight All engines have them and these "power bands are really the peak of what s also called the torque curve Band meaning sp[ecific point and duration everything is working together. a gas lawn mower engine is set up to run inside this band. Thats why it doesn't fall on its fsce on the first patch of grass.
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..

Sep 23, 2009 | 2003 Suzuki RM 125

1 Answer

No power band. full open throttle is only about

hi mate check the rings havent gone by using a compression tester take the sprak plug out and screw the guage into the spark plug hole and kick the bike over a few times until the guage goes up no more if it goes over 100psi/7.5 bar thats fine also check the air filter is clean and also take the carb off and just give a good clean e.g the jets etc here is a picture of the compression testerdb567d7.jpg

Aug 25, 2009 | 1988 Honda VT 800

1 Answer

Suzuki vl 1500 wount turn over been getting more and more harder to turn over. replaced battery starter motor selonod think it is a compreshon problem as i can bump start it no problemm any one had this...

I had the same problem on my VL1500. I THINK it gets "flooded" with fuel and then the cylinder is full and will NOT turn. I have used jumper-cables to start the bike when it will not turn over.

I now start my bike with this procedure:
1. Do NOT touch the throttle.
2. Switch on the power.
3. Do NOT touch the throttle.
4. Press the "Start" button and crank the engine a little (1 - 2 seconds)
5. Do NOT touch the throttle.
6. Keep cranking the engine (another 1 - 2 seconds)
7. Open the throttle a VERY LITTLE (approx. 1/10 turn of throttle). keep the throttle slightly open while the engine cranks.
8. Keep cranking the engine and wait for engine to start (another 1 - 10 seconds).

It is still not a perfect start, but at least the engine cranks over now.

Remember that the VL1500 has a "decompression" system that opens the outlet valve for 2 cranks of the engine.

I suggest you FIRST make sure the engine cranks over (NO throttle), and THEN concentrate on starting the big V Twin.

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