Maintenance & Technical > KX500 Original

93' kx 500 rich in 1st 3/4 throttle

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Rulingtheroost:
Hi I just picked up a 93' kx 500 new top end fmf fatty pipe n silencer test rode it real fat had a hard time clearing it out has stock jetting 168m 58 p 3rd clip neddle. So I started looking checked reeds looked good no cracks fliped 1 went to 165 m 52p 1 clip leaner on neddle set air screw 2 turns out bel ray 40:1 110 av gas rode it better but still not right played with air screw got better the more I turned it out I'm at 4 turns out now and thats to far also 95 deg. and humid whats your thought oh btw runs awsome on main

Foxx4Beaver:
4 turns out on air screw is no good.
what's your elevation?
what needle are you running?
have you done a leak down test to be sure you don't have an air leak?

base point is...

168 main
55 pilot
3rd clip on needle
roughly 1 1/2 to 2 turns out on air screw.

Rulingtheroost:
Around 1200' northeast pa. adjusted float height went to 48 pilot

Rulingtheroost:
Just put a 48 pilot now hangs on idle and idle screw does nothing adjusting air screw helps with the fat middle but makes idle higher going back to 52 pilot there's got to be something wrong ie bad reed float height needle jet holder? 

Foxx4Beaver:
could be a worn needle seat.

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