Maintenance & Technical > KX250 / KX125

KX125 Woods Conversion

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Defy:
--Help for stalling
Basicly the a light flywheel is easier to spin/stop spinning there for when you let off the clutch it doesn't have much moment to keep it spinning so it's easier to stall than a heavier flywheel. 
--Low End
Same concept the heavier flywheel takes longer to get up to speed so it gives you that low end but robs the highend.  I don't have the need for the really highend because i can't get the thing out of 4th in the places i ride. 

Looks really easy to install just search FWW and you will find pics.

Thats my stab at it, someone tell me if im wrong. 

eprovenzano:
It helps to keep the rear gaining traction instead of breaking loose.  On my 250 I run an 11oz FWW.  It is very easy to install.  If you put on on your 125, I'd go 6-7oz.  Any more than that I think would rob power vrs helping the bike in the tough terrian.

megad:
what year bike, and what's your weight?

I've got a 2003 kx125 setup for the woods, there are some issues

the 2003 lacks bottom end power, this is a huge issue and I gave up on the bike because of this, it's now my wifes bike, I have a ktm 200

the forks need a revalve, I just did mine and posted the shim stack I'm trying next


for mine I did..

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
hinson clutch setup with steel plates
fork revalve

that's all I can think of, the only real issue is when your on a steep hill climb, 5 diamond stuff, if you drop off the pipe the power drops sooo fast you will stall, heavy clutching helps but it's very hard to stop wheelspin doing that  I'm 200 pounds that did not help, the on/off power on the 2003 also is a real pain when it's wet

I'm really glad I upgraded to a ktm 200 it's better in every way

Defy:
yeah the more and more i look at it i should have either got a bigger bike or went 4 stroke for what i am doing.  The bike is a 2001 Kx 125 and im am about 165.  I am looking to put either a 7 oz or a 9 oz fww weight and add one tooth to the back and run it like that.  I really like the speed of the th bike thats why i went with the 125 instead of the 250 (i wheelied the 250 like 5 times in a row and i said too much for now)  I still haven't decided what i am going to do i need to put brakes and a rear tire on it to get it back too good order then i might sell or trade for a 4 stroke about the same size.  well see. 

How is the 9oz FWW?  Do you think that would be too big for me? 

eprovenzano:
I'd go with the 7 oz FWW.  Don't despair, I think you may be happy with the 125.  If set up correctly they are a great bike.  The proper gearing is very important.  Run a 13 tooth front sprocket, and a 49-51 in the rear.  Add good tires, and just have fun.  The 125's are so light, that you can throw them around and don't be mistaken, that can pack a punch when ridden hard.

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