I have an 05' raptor 350 with few hours on it, everything is clean, never been in deep water, but it backfires now, help please!

 

when does it backfire? when you let off the gas or when you try to accelerate? and im guessing its all stock? airbox lid isnt removed? reverse sensor and parking break sensor i think can also cause problems if there faulty

 

It backfires the worst at an idle, it lessens during acceleration, but still does it. It's all stock. Will the air box lid being off cause it to backfire?

 

yea removing the lid draws in alot more air requiring you to richen it up, which involves using a bigger main jet, adjusting the needle, the fuel screw on it might need adjusting they come kinda lean from the factory, screw it all the way in untill seated then back it off 2 1/2 rotations and see if it cures it if not you can play with it a lil and it might smooth out the idle, it might also need a good carb cleaning.