2003 Yamaha YZ 250 F Logo
Anonymous Posted on Jun 11, 2009

VERY hard starting takes way to many kicks usually play out befo

Bike runs well if you do not play out trying to start it (30 to 50 kicks ) once running it is good but if it stalls ,it takes all the stamina you can to get it up and running . we can,t put finger on the problem tried new spark plug clean carb and gas tank unit is playing us out Help please?

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tombones

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  • Posted on Jun 11, 2009
tombones
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There is a proper way to start the engine. Four controls are on your bike to assist in starting.

  • 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.
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. Release the de-compression lever. Give the throttle a 1/4 turn then let it snap closed. A diaphragm 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. Give a strong kick through the full sweep of the kickstart lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a 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), until the bike starts. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

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tbrat44

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  • Expert 86 Answers
  • Posted on Jun 11, 2009
tbrat44
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Does it have good compression and good spark? after kicking it over several times pull the plug and see if its wet.. check air filter, and air fuel mix adjustment screw. whats the fuel oil mix ratio at?

Testimonial: "Changed the gas and the sparkplug cleaned up the carb all is good now thanks a bunch."

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hope this helps
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