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rpm not stable & battery issue

  #1  
Old 04-06-2012, 08:53 PM
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Location: Stockton, CA
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Default rpm not stable & battery issue

i put my bike in neutral and rev it to any rpm above 2k
so i rev it to 4k and leave it there but the rpm jumps up and down
i rev it to 5k and leave it there and rpm still jumps up and down
i think it goes around from -100 to normal. so 5k would be 4900k then back.
IT IS NOT MY HAND. i have my hands perfectly still.

never mind the battery question.
 

Last edited by omg209; 04-06-2012 at 09:18 PM. Reason: remove question
  #2  
Old 04-07-2012, 10:47 AM
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you mean its steady at 4k, jumps down to 1k and back? or steady at 4k and jumps down to maybe 3k and back? Ive read it could be possible its the FPR(Fuel Pressure Regulator) or a map sensor.
 
  #3  
Old 04-07-2012, 01:27 PM
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no i meant lets say i rev it to 5k, it would then go to 4.9k and back. but i think i got it fixed now, the cause was a damn dead battery. got a new one and rpms were normal again.
 
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