KTM backfiring and running hot

I have a 2006 KTM 450 SX that has 20 hours on it, It has always backfired a little since I bought it new.  But it seems to be getting worse.  I have checked the valves and they are good.  I herd that they come too lean from the factory.  Do I need to lean it up or what do I do.  

well usually backfiring means that you are running too rich
thats what i have been told  
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1998 cr125
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backfiring and runnin hot are common symptoms of running lean,pick the needle up a notch mabye bump up a jet size or 2.my buddy like to run a octane booster in his gas when i use this i can boil over like nothin did you change gas?think about what youve done different before messin with the carb.also remember the original settings so you can start at square 1 if you dont get the fix on the first try  
---------------- different toilet,same ***

DR recomened raising the needle, dont remember which one of the MANY ktm articles but all of them say the same thing.
leaking air into the exhaust system will cause the same problem. New pipe? check all gaskets and connection points  
90 KTM 250
90 KTM 500
86 CR 80
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