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Raptor 700 backfire

  #1  
Old 05-28-2019, 01:16 PM
Weekend Warrior
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Default Raptor 700 backfire

Hello I have a 2008 raptor 700r... Stock. the baffel came loose and then just shot out the back, I've heard of guys taking them out so i thought no big deal. But since that happened, it's been not wanting to idle and backfiring especially on start up. Does it need that back pressure? Or do I need to mess worth the air fuel ratio since the exhaust is now modified. Is it maybe a fowled plug or valves out of adjustment? Thanks for the help
 
  #2  
Old 05-29-2019, 05:00 AM
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Could be any of your suggestions. So, fit a new plug, adjust the valves. If that doesn't work you could try cleaning and adjusting the carb. One reason for a bike blowing it's baffles out is incorrect air/fuel ratio anyway so you could have been running lean before it blew them out, due to dirt in a jet.
 
  #3  
Old 05-29-2019, 08:35 AM
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This bike is EFI, so could it be electronics that are off?
 
  #4  
Old 05-29-2019, 08:38 AM
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Isn't The Raptor 700 fuel injected? Check the valves. Also a new plug can't hurt.
Is the backfire coming from the intake or the exhaust?
 
  #5  
Old 05-29-2019, 08:39 AM
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Exhaust
 
  #6  
Old 05-30-2019, 02:30 AM
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"This bike is EFI,"

My apologies, on most Quad EFI systems you can't "mess worth the air fuel ratio" so I assumed carburettor. More likely to be dirt in the injector or a blocked fuel filter than the electronics giving trouble. Though a sensor telling the ECU lies can cause all sorts of problems, and it is extremely difficult to diagnose unless it throws a fault code up, which can be read by diagnostic equipment.
 
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