Maintenance & Technical > KX250 / KX125

KX125 Woods Conversion

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Defy:
Any help?  I grew up riding 4 strokes and tooling around in the woods.  Some of my friends had 2 strokes and they would smoke me so i always wanted one.  So i finaly bought a KX 125 (to start with i will get a 250 after i build up some confidence) and when i first test drove it i thought it was broke becuase the was no bottom end but i had a friend check it out and said it was fine.  Where i live now i will be doing more woods riding rather than taking it to a track so i was courious what should i do?  From searching the past post everyone said buy a gnarly pipe, FWW, and re gear.  is that all?  Thanks

Nick

The Flyin Hawaiian:
I rode enduros on a 2000 YZ 125 and did pretty much the same mods that you have listed except for the fww. I did have a V-Force reed cage. Which helped out a bit in the low end. The reason I didnt use a fww was because I felt it would bog the engine down too much on a 125. Also, and this may sound funny, dont run too big of a rear tire because this too could bog the engine. Stick with the oem size. Depending on the year, a company called Athena makes bolt on 144 big bore kits for 125s for about 5-600 bucks. You have to ride 125s pretty agressively to overcome their inherant lack of low end. Keep it singing, work the clutch and row through the gearbox.  :-D

KXcam22:
Defy,
  Theres lots you can do to pump up the bottom end.  It will never be a tractor but should be fine for woods riding.   Here is what I suggest (in order):

skid plate (you can make this easy for cheap)
rad guards (the cheap ones work just as well as the big $$ ones)
bark busters
flywheel weight (most bang for the buck on a small engine)
larger rear sprocket (add 2 teeth)
reeds (boysen dual stage (low cost) or vforce (higher cost)
Gnarly pipe.

You will notice that I have the guards first.  With the bike (and you) protected you can hit obstacles with more momentum with greater peace of mind.  Hope this helps. Cam.

Defy:
rad gards are they like the plasti fins that are on my bike?  Or should i get metal ones?  i have ordered metal hand guards and a fww so it looks like i need to make a skid plate!  Any one have templates? 

lhazc:
ok, is  FWW  the fly wheel weight?   not seeing/understanding how that could help that much.... ?? what does it do.   i see that many people use them but dont know why... :?   what all do you have to take off to put one on?  how do you know where excatly where to put it and are there different sizes??   thanks

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