kx125 carburation problem?
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Thread: kx125 carburation problem?

  1. #1
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    Default kx125 carburation problem?

    ok guys, i have a 96 kx125 that i have rebuilt from the ground up. heres the list that i have done to the motor

    wesico piston
    hot rods connecting rod and crank bearing
    crank bearings
    all new transmision bearings
    water pump assembly
    powervavle assembly
    boisen power reeds
    all new gaskets

    now with that all said, i got it rebuilt and put all back together, double mixed my first tank like i was spose too. and it didnt run for **** then but i figured it was because of the double mix tank of gas, once i ran that tank through i then put 92 octaine gas in with some amzoil to 32:1 ratio. i put that in and i still have no out of the hole or 0-1/3 throttle. if i romp on it when starting in first gear it just bogs out dramatically untill you get up to higher speeds but once the powerband kicks in it runs like a raped ape. i checked the plug and the plug was reading SUPER wet and black, like right on the verge of being fowled.. i took the carb off, went through it (again), everything looked fine. super clean. i messed with the screw adjustments but nothing made a diff. i then took the carb off again and let my instructor look at it, he noticed that it was sucking air past the low speed jet, (where they have the tamper proof screws holding the low speed part to the carb) i took that off and the O-rings that were under there were ruined. i talked to a kawasaki rep and they told me if those were shot then you have to buy a new carburator because no one is spose to mess with those????? so i just ran to the local hardware store and made some O-rings work and then put it back in. I got it all back together and it made a hell of a diffrence but it still wasnt even close to like it should? i checked the plug and now the plug was reading super dry almost too lean... Do you think that its still those O-rings? The kawasaki rep told me to do a primary and secondary compresion test and he didnt really think that the O-rings were the problem? Does anyone know where i can go to get the actually O-rings instead of the ones i used??? sorry for the long thread but thanks for reading... please help!

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  3. #2
    ***Vintage Rider*** BTK Expert hot_shoe_cv's Avatar
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    I'm assuming your carb is a Keihin. A decent Kawi dealer should be able to order the O-rings for you. Otherwise, why not contact Keihin or a factory distributor for those parts. Meanwhile, if the plug is white at the electrodes I wouldn't run it or all your money & time on the motor will be gone down the drain. After you fix the o-ring problem and you still have the low end problem it must be jetting. Try raising the needle jet to the 4th notch and if that doesn't help then a fatter pilot jet should. idle to 1/4 throttle is the pilot jets domain...1/4 to 3/4 is the jet needle and some overlapetween the two is sometimes possible.
    Last edited by hot_shoe_cv; 08-06-2005 at 11:38 AM.
    02 Mean Streak, Jardine 2/1 pipe, hiway bars w/pegs, floor boards,ISOgrips w/throttle boss, Kriss head light modulator, Corbin Young Gun ostrich saddle, etc.
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    its not white, just the exhaust side is, but is a lil leaner than one guy would want... i will have to look into it more on those O-rings but i know my instrustor said the same thing the kawi rep did, hints why i had to go down to the hardware store and make some work......

  5. #4
    ***Vintage Rider*** BTK Expert hot_shoe_cv's Avatar
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    I edited my original post to add some other ideas.
    02 Mean Streak, Jardine 2/1 pipe, hiway bars w/pegs, floor boards,ISOgrips w/throttle boss, Kriss head light modulator, Corbin Young Gun ostrich saddle, etc.
    660 Yamaha Raptor sport quad for the dirt.

  6. #5
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    i did go with a bigger pilot jet, went from a 42 to a 50 and it got worse i think, couoldnt really tell.... but the plug was reading a little better after doing that... the needle jet is in the middle right now, i can try raising it up one....

  7. #6
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    ok, ive been looking on keihin's site and it states on there site that they dont do individual sales to private customers and to go through a dealer? but there arnt any dealers that will sell me the parts?

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