Maintenance & Technical > KX250 / KX125

Low End Power/Torq

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thumpy3:
I want to know what is best to improve low end power on a 2005 KX 250 R1
What Pipe?
What, if any, fly wheel weight?
FM Gnarly or Pro Circuit Works series?
With gearing of 1451

I'm a big guy who is used to racing an XR650R in Best in the Desert and I'm trying to build an Enduro bike out of a KX250.

hughes:
FMF Gnarly or Pro Circuit Platinum 2 These two pipes are low-mid range pipes.
Flywheel weight would make the bike have less hit and more traction. I am unsure of what weight (ounces) would be best.
I think a v-force reed system would work really good.
I think moose makes a reed block spacer your could try.
Last chance would be porting.

Is this bike going to run in the desert or in the woods?

TPhill:
I have a 91 KX250 with a Pro Circuit Works pipe and an Answer spark arrestor (with a top end porting job) and my wife has a 2000 KS 250 with and FMY pipe and silencer. Mine has better bottom end, but will still pull the front tire in 4th gear. Hers seems to have a little less bottom end, more power on the top end. I dont know if its the exhaust set-up of the fact that my engine has had a porting job done to it, but it really pulls nice down low (for a 2 stroke that is). :mrgreen:

eprovenzano:
I have a 99 KX250 with a PC pipe.  I too was looking for more low end grunt.  I've changed the front sprocket from a 14 to a 13.  I also am adding a 11oz flywheel weight.  The gearing made the bike much easier to ride in the woods.  I haven't installed the flywheel weight yet, but am looking for more traction, making the tight woods easier.

A friend of mine has a YZF450.  He took my KX for a spin, he said if he knew he could get that kind of low end power our of 2 smoker, he would have not spend the $$ buying the thumper.  He wants to ride it again after I get the flywheel weight installed.  Maybe I'll be able to bring him back from the dark side and back onto a 2 smoker.... 8-)

FPMXer:
Pipes and flywheel weights will help the motors power output and can be tuned to your liking. If your looking for good pull out of the hole or a corner add some teeth to the rear sprocket and hang on. :-o I had a 48 on the rear of my 125 and it had great top end. I put a 51 toother on the rear and dang what a difference out of a corner and the hole. You will give up some of the top end but even a 50 toother will suit your taste. Instead of buying them borrow them from a friend if possible and figure out which one you like the best.

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