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

 

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.

 

This bike is EFI, so could it be electronics that are off?

 

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?

 

Exhaust

 

"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.