What are my options for more torque on an 88 KX 125. Besides trading it for a 4 - Stroke.

The lowdown is that this was a free bike that i got running but there is no lower end power, mid and top are great. I am used to riding a 4-stroke XR250R. The majority of the riding i do is in the woods.

I know about replacing the engine end sprocket but is it more teeth or less teeth for low end grunt. What about torque reeds for low end? Do they work?

Thanks in advance!

Hunter

Less front sprocket teeth = more low end torque.

Three extra rear sprocket teeth = one tooth smaller front sprocket.

Hope this helps.

Later.


Jimmy :beer:

less teeth in the front and more teeth in the back. don't go real small in the front it is hard on your chain and builds resistence from bending around a sharper point.(loss of power bad)
when you lower your gearing it will have a transmission ratio effect making it a closer ratio trans. you will find yourself shifting alot more.
it's not necceceraly going to give you more torque it is going to give you more gearing choices in the lower speeds. this will enable you to keep that screamer on the pipe where it needs to be. after market reeds are good but if you have the money you will get better results with a pipe designed for lower rmps. but i wouldn't do that to a 125. a 125 needs to be reved it wants to. reved to the moon is the only place that it will be happy. if you want torque a 125 is the worst bike to look for it in.

just rev it and shift like crazy and practice that left hand clutch fan.

some other things to help on power for a 125. run a roller chain not an "O" ring the "O" ring takes up HP. also run a regular rear inner tube not the big thick thorn proof ones and don't pour slime in it either. you want that rear wheel to blast into a spin real easy.
have fun

sell it and buy an old 250. A 125 for the woods sucks, (unless you race and then it can actually be good). Anyways, I have seen many a 125 rider in the woods. It isnt pretty. :barf:

Also, Look at an old KDX200, excellent trailbike with more low end snap then the 125.

I know you dont want another bike, but it would be a lot easier then trying to make that thing more powerful.

Originally posted by Yo Mammy Boy
BLAH BLAH BLAH

Yes 125's have no power, BUT when I rode with they guys back in the day that were 250A riders in the woods, they said riding a 125 was the best thing they did in the woods. Riding a powerless bike will teach you how to maintain momentum and smoothness, and choosing good lines, which if you bring that to a 250 you will be way fast.

If you have no intention of getting really good, then mess around with the 125 for a while, but don't put too much into that bike ($$$ wise) before you decide to make the jump to a 250.

Thanks for the advice, i will more than likely just ride it hard till it pukes parts or i can afford to trade up. What the hell....it was free.

Thanks,

Hunter

it has good mid to top so ride it in the power band...whether that be 1 gear lower bouncing off p/b or just ride faster. you'll get used to it. I grew up on 2 strokes so a 4 stroke of old in the woods just feels funny to me.

you could just put a low end pipe on it, rejet and in conjunction with gearing and then it should do what you want.
good luck

The best thing you can do for your bike is add a flywheel weight. Not only will it help you with power but it will help you not stall your bike.

Loose 1 tooth on the front and add 2 or 3 in the back.