I have noticed lately that on start up until quad is warmed up, when i give it a quick blip of throttle black smoke comes out(enough to notice it). Is this normal or what could be the problem?? Thanks a lot

 

black smoke is usually a sign of being a lil rich, what kind of bike is it?

 

is your bike a 2 stroke?

 

normal

 

sorry, its a 02 Raptor (sparks x6 full exhaust, snorkle trimmed, lid on with 2-2" holes cut in lid, K&N filter w adapter, gytr jet kit, 160/165, 25 pilots, 3 turns out on air/fuel screws(had them in further but it kept backfiring on deceleration and at 3 turns on each it stopped that)roughly 1000 ft above sea level

 

Sounds pretty normal to me..mine does the same thing untill it is warm.