Question about 2004 Yamaha YZ 250 F

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2004 YZ 250 4 STROKE PROBLEMS STARTING - 2004 Yamaha YZ 250 F

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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.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder, (power valve).
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.

Go to this site and you can download a free PDF service manual. The site may take up to 20 seconds to load the complete list of manuals. Yours is on the list.
www.carlsalter.com/motorcycle-manuals.asp

Posted on Nov 19, 2009

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SOURCE: are there many problems with the yamaha

This biike has a great reputation for trouble free operation. Of course with any thing mechanical, things can happen. You can minimize unfortunate happenings by keeping an eye on everything. Check systems regularly and attend to any problems as they might occur. Maintennance is the key. Good Luck! I hope you find this to be very helpful!

Posted on Dec 14, 2009

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Top rating due on this one! Thanks!

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