1986 Kx250 Jetting problem

[Kx250colin]

HI i have a 1986 Kx250. When i start getting into high rpms it sort of boggs down but if i give the throttle a quick twist it will be fine again. I live in Denver, Colorado. The elevation is 5000 feet. Should i move the needle clip? It is currently in the 3rd position

[01blaster_freak]

Check an see what your plug looks like.

[Kx250colin]

its black and wet

[MX86]

go one main size leaner (smaller)

[01blaster_freak]

Yes what he said

[Kx250colin]

or can i just move the needle position

[MX86]

personally i would do the jet, that way in a pinch you can always adjust the needle....

[nd4speed]

Just curious, what carb brand/size and jets are you using. I am trying to jet the same bike (86 KX250).

[01blaster_freak]

He's jettin his at 5000 feet though, so jet sizes might be diff

[Kx250colin]

i havent even messed with the needle yet so should i move it up or down