jetting for altitude change

[jjm400ex]

my friend has a 06 banshee, only mod is aftermarket exhaust, he used to ride at 6000 elevation, has recently moved and rides at about 1000 ft elev. what is a recommended jetting for this elev.
i'm a fourstroke guy and have no clue on 2 strokes.

[bloodmoney23]

its easy buy a jet kit and install recomended jets for elevation according to instructions and make adjustments as needed after. Nobody can really give advice on the matter cause every bike is different.