99' Zl EFI 600 back fire at altitude

Daine

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Jan 3, 2010
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Alberta
Runs 100% down here on the flats but at altitude it seems to have a midrange back fire. Anyone have an idea as to what this could be?

Thanks
 

*Joemama*

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Feb 1, 2008
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i have a 98 ZR 600 EFI
i was having problems with my sled cutting out then back firing.
turned out to be the throttle safety switch.
i just cut a red wire and my problems were solved.
hope this helps you in some way
 
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