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I’ve just recently received an 09 raptor 350 and I’ve cleaned the carb multiple times now but it still doesn’t run right. It has stock exhaust and carb jets, has K&N filter and no air box lid, it idles perfect and will run for a bit, but it will start to backfire and pop about half way through the revs, I figured it was bad gas so I ran it for a while hoping it would clean itself out, it ended up getting really hot and died, wouldn’t start for a while and when I did it was doing the same thing, I’m suspecting it’s leaning out but I don’t know how to work with carbs
 

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I’ve just recently received an 09 raptor 350 and I’ve cleaned the carb multiple times now but it still doesn’t run right. It has stock exhaust and carb jets, has K&N filter and no air box lid, it idles perfect and will run for a bit, but it will start to backfire and pop about half way through the revs, I figured it was bad gas so I ran it for a while hoping it would clean itself out, it ended up getting really hot and died, wouldn’t start for a while and when I did it was doing the same thing, I’m suspecting it’s leaning out but I don’t know how to work with carbs
You need to either richen the jetting (bigger pilot, raise needle, bigger main) or put a lid on the airbox.
 

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I think i may be having a mild case of the same issue. Everything runs fine once its warmed up but in when it first starts up it seems to have a sort of backfire from the carb in low RPMs, almost seems like a "hiccup". Let me know if you find a solution or if anyone else has any tips to fix the issue please let me know. Replacing the filter and filter cage soon so hopefully it runs a little smoother. Could the air filter be letting in too much air? The foam on the under side of the cage is worn badly so it does not make a tight seal when placed in the airbox. Hence why I am replacing the entire cage. Any help is greatly appreciated!!
 
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