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I have been working on this KFX450 and it was rude all day and it back fired and cut off and now won't run I have been through all the wiring and it's all my but it seems the roll over switch is not getting enough power it seems real week does anyone
 

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Welcome to the Forum...!!!

Always make sure the battery is fully charged (12.8v standard) due to the digital fuel injection system...!

DON'T touch the throttle until motor is running after key is turned ON...

Make sure your throttle cable has a little slack so it closes completely & check your throttle positioning/TPS sensor to be in range...
easier with sensor adapter part# 57001-1538 or here Kawasaki 57001-1538 - SENSOR ADAPTER | eBay

Also test your vehicle down sensor...arrow up 3.7~ 4.4 DCV See pictures attached
 

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