Question about 2008 BMW G 650 Xchallenge

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Xchallenge won't start when ehgine is hot.

Starts first time when engine is cold. Splutters and backfires repeatedly when the engine is hot (e.g filling up with petrol or short stop). If you are lucky it may eventually fire up after about 6 to 10 tries but any more and the battery is too low to turn the engine over = long push home.

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  • RescueTechLA
    RescueTechLA May 11, 2010

    I've got a service manual for an F650. Would that do you any good?

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ButtFuzz
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SOURCE: Xchallenge won't start when engine is hot.

Check tightness of bolt where (carb/FI) goes into intake, and where intake goes into engine. Check gaskets in those locations, if any. Sounds like heat is causing some material to distort, causing a vacuum leak.

Posted on Feb 27, 2009

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Difficult to start


There is a proper way to start an engine. Most bikes have four controls 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. Now 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. 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), until the bike starts. Go ahead and give it another primer shot after the 5th kick attempt. A good battery, a clean spark plug, a clean carb and clean air filter will also aid in starting.

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  • The choke, used when the engine is cold. Pull the red knob for choke.
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  • The de-compression lever, always used.
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  • 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. Now 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. 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), 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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Xchallenge won't start when engine is hot.


Check tightness of bolt where (carb/FI) goes into intake, and where intake goes into engine. Check gaskets in those locations, if any. Sounds like heat is causing some material to distort, causing a vacuum leak.

Feb 27, 2009 | 2008 BMW G 650 Xchallenge

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