Question about 2003 kawasaki KX 250
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
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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Posted on Jan 02, 2017
Tips for a great answer:
Nov 08, 2011 | 2001 KTM EXC 200
Sep 25, 2011 | 2003 Oldsmobile Silhouette
is a proper way to start the engine. Four controls are on your bike to assist
in starting. Below are generic instructions.
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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