Maintenance & Technical > KX250 / KX125

2003 kx125 for wife, porting, suspension mods

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eprovenzano:
I think the 9 ox FWW may be a bit heavy, but for what you are trying to do, it may be the right option.  You may want to change the gearing, dropping a tooth in the front, adding 1- 2 in the rear.  Adjusting the power valve will also make more "woods" friendly.  As stated earlier , it will never be a tractor, but I think you can make it a pretty decent woods bike.

Let us know what mods you did and how it well they worked.

megad:

--- Quote from: eprovenzano on May 02, 2007, 02:41:19 AM ---I think the 9 ox FWW may be a bit heavy, but for what you are trying to do, it may be the right option.  You may want to change the gearing, dropping a tooth in the front, adding 1- 2 in the rear.  Adjusting the power valve will also make more "woods" friendly.  As stated earlier , it will never be a tractor, but I think you can make it a pretty decent woods bike.

Let us know what mods you did and how it well they worked.


--- End quote ---

9oz is largest I can find, couple local tuners told me to use a 12oz and it would help a little more

how do you adjust the power valve?  For my wife they said to unhook it, as she has zero use for that power, she does not rev it up enough to hit it, and when it does hit it just scares her

bark busters
narrow protaper bars
scotts damper
12tooth front 51 rear
pro circuit type 296 spark arrestor silencer (still LOUD for my taste)
9oz flywheel weight
coil advanced position
back on stock pipe now, quieter and toned down the hit, had a pro circuit
hinson clutch setup with steel plates

The Flyin Hawaiian:
I researched the 144 kit a little further and all I found was the 125 rebuild kit by Athena, sorry for the misinformation. I did find that Max Power/RPM makes several big bores for the KX 125. The Athena kit I saw was for the YZ 125, I assumed that they made it for all the 125s. :oops:

eprovenzano:
I could be wrong, someone please correct me if I am wrong, but I think the cases of the YZ do not need to be modified to accept the 144, while the cases of the KX require modification to accept a 144.

megad:
anyone using a moose torque spacer, or copper washers between exaust and cylinder

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