Maintenance & Technical > KX250 / KX125
Low End Power/Torq
kx666:
For the most partthere is not much porting that can be done to a modern bike that will not kill reliabillity. ususally you loose low end power from porting, it is difficult to gain low end.
flywheel weights are a good way of gaining low end, so is milling the head. just keep in miind you will be creating much more heat. milling a head is one of the easyest modifications you can do, and it will only cost a new headgasket. (if you are milling your head make sure to take your measurements with the gaskets you are planning on using. most builds can safely run a .060" quench band)
you can allways remove more so dont get too greedy. good luck on your build, i hope it is better than my spelling :wink:
eprovenzano:
I recently changed my gearing to 13 front, 50 rear. I couldn't wait to try it out. I changed from a 14 to a 13 front about 4 months ago. Loved the change. The rear sprocket and the chain was due to be replaced, so I went from a 49 to a 50 rear with a new chain. The only problem I have on long hill climbs is trying to keep the front wheel down.... I keep riding up on one wheel. While everyone thought that was great, let me tell everyone here, that wasn't my intention... at least at first. But after a few runs, I would pick up the front wheel just to see how far I could carry her...
Yes the gearing is low, but for woods riding, its like a tractor. All I need to do is point, and the bike will go where I want to go.
This bike has never failed me... (now that I said that, it will die on me deep in the woods...)
What sprockets are you running? This is the easiest and least expensive way to get the low end tourque your looking for, of course you sacrifice some top end... (but I'm too d**n old to go as fast as I did when I was 15... plus its takes a lot longer to recover from an oops)
Mudshark:
As far as flywheel weights go, I have been reading lot on this subject (I want to
do the same to mine) From what I read, 9oz is the way to go. This will still leave
you with snap, but keep the motor turning over the hairy slow stuff, without
having to ride the clutch.
eprovenzano:
I purchased an 11oz, but haven't installed it yet. The bike runs so well, I'm not sure if I'm going to install it or not...
I'm not in too big of a hurry, as I did an endo last weekend, and was planted into a hill side. Its been 3 day's and I'm still in excruciating pain when I take a deep breath. Can you say cracked rib(s). So I will not be on the bike for a little while...
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