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I'll leave that the one to the Old Salts here! j/k I have no idea, but, waiting to hear this one!
 

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Limp mode on a Burgman has to do with a systems failure,
& the ECM (computer) drops into default mode, but still
allows the scoot to operate in a 'sick' condition, enough
to hopefully get you home.
 

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Like Duster said it's get you to a safe place mode. When the ECM gets a reading from a sensor that tells it there is a significant problem that could do harm to the engine it will go into a mode that will still allow you to proceed but at a reduced performance level.

Exactly what it will do depends on the error condition and which bike you are riding. For some conditions the bike will continue to run but if you turn it off you cannot restart it. Others will allow a restart. If you have access to a service manual look up fail-safe function in the FI section. You will find a list of the conditions and responses the ECM will take for each.
 

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"Your engine management and maybe even your transmission is controlled by the ECU. As you know, all computers crash, all software has bugs, and mechanical equipment fails. As such, many ECU units are fitted with a 'limp home mode'. When it detects that something semi-serious is wrong, it enters the limp mode, which means that the engine won't rev beyond a pre-programmed speed, you can't accelerate very fast, or you may indeed be speed-restricted to 40 mph or similar. The transmission may even stay in one or two gears. Bad? Well, no, not really: The alternative would be to either let you drive at regular speeds, with the danger of letting you trash your car (expensive repair, means happy repair people, but angry driver), or stopping you from going anywhere (expensive recovery and stranded on the side of the road means happy recovery company, but angry driver)."

http://wiki.answers.com/Q/What_is_a_limp_mode

how to fix it:

http://burgmanusa.com/forums/15-burgman-650/19031-limp-mode-fixed.html
 

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There is no one single fix. What will need to be done will depend on what sensor is sending a bad reading to the ECM. To find that out you will need to put the ECM in dealer mode and find out what code has been set then correct the problem associated with that code.
 
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