Maintenance & Technical > KX500 Original

Jetting and altitude change

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Johnniespeed:
Bigtim, I am from Michigan ( about 765 ft above sea level ) and when I go to Colorado to ski, I too get winded from only a flight of stairs, but after about five days that goes away. Lots of water helps some. Never tried rejetting at that altitude yet.
 John
What is the altitude where you are ?

Atrain:
Bigtim. I'm at 8600ft and go up from there. I run a 150 main and 40 pilot. I have the clip in the first position and the air screw at 2 1/2. FMF Gnarly pipe.

barryadam:
I think I'm at 165 now on my main.
I've only noticed jetting issues when I run WFO for extended runs on El Mirage (el 2840).
SBNF, Los Padres, etc. are higher elevations, but never a problem because they are not WFO riding.  Even Johnson Valley (Soggy Dry Lake, Sunfair Dry lake), has not been a problem as they are not nearly as looonnnnggg of a WFO run as EM.
So unless you are blazing to the Husky at full speed for extended time, I wouldn't worry about the main.  You are more likely to be running on the pilot jet which seems to me to be less sensitive.  What pilot jet are you running?

How did you get a 160 for 4500 feet off the jetting chart?

jfabmotorsports.com:
Crean and oil the filter properly, put in a good used plug, find a nice stretch of road, run it full throtle for 5-10 sec and kill it clean. Clean means do not let it idle. WOT push the kill button and clutch it all at the same time.
    Now go read the plug.

  The main jet on a carburetor is not there for those long extended runs. If you are in the main circuit for a micro sec then the air fuel ratio needs be right, as with the other circuits.

95formula847:

--- Quote from: jfabmotorsports.com on September 24, 2009, 06:02:04 AM ---Crean and oil the filter properly, put in a good used plug, find a nice stretch of road, run it full throtle for 5-10 sec and kill it clean. Clean means do not let it idle. WOT push the kill button and clutch it all at the same time.
    Now go read the plug.

  The main jet on a carburetor is not there for those long extended runs. If you are in the main circuit for a micro sec then the air fuel ratio needs be right, as with the other circuits.

--- End quote ---

I dont wanna change the subject but quick question. Since the method you just explained is for the main jet and clip... could you lug a bike around and do the same to get your pilot jet? Im a noob to all of this.

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