Maintenance & Technical > KX500 Original

confused jetting

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bige:
im really confused on my jetting situation,heres the deal 2003 kx 500 all stock even the brass, compression good with fresh top end, reeds, etc. mix fuel 93 octane klotz 32:1, elevation 2000ft, air temp 60deg. stock jetting is real rich so i droped main jet to a 165, pilot a 55, and needle clip to #2, air screw 2 turns out. bike ran cleaner but still had some studdering at 1/8 to 1/4 throttle, looked at porcilian of plug at base, had black ring half way up then rest was dark brown, so i leaned it out more. main 162, pilot 52, needle same clip #2 and airscrew 1.5 now my plug is still black half way up porcilian but rest way up is off white, from every thing i read there should be a brown ring a few millimeters up from base no black, my question is should i go to a 160 main? but every jetting chart i see from pro circuit to team greens all are at or close to stock jetting. i want max power but in order to get my plug to read right i need to lean it out beyound my comfort zone. should i go by the base of plug color or keep jetting to rich with what i got.

Motorrad:
what heat range plug you running?   and what plug for that matter...      :wink:

32:1 is a bit heavy on oil (in my oppinion....  dont want to turn this into a Oil war like so many a thread has gone to)

Welcome to the site BTW..

Foxx4Beaver:
x2 heavy on oil.

bige:
br8es

Motorrad:

--- Quote from: bige on November 30, 2011, 11:56:40 AM ---br8es

--- End quote ---

#1.. buy a better plug...    K5 likes the gold paladium and iridium style plugs (reason it calls for em in the manual)

#2 drop the oil back to 36-40:1     (I run 40:1) which is what Id reccomend... especially on Klotz Super tech...

go back to your 165 55 jetting and see what it does...

as it sounded like you were close there..    
the Black ring can be a combo of s**tty plug, too much oil... and perhapse you may need to jump a heat range...
but dont jump a heat range till you change the first two issues...

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