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Morehead city, NC
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MX_Andrew83
8/5/2016 6:51pm
8/5/2016 6:51pm
I'd like to pick up an 05 or newer 125 to completely rebuild. I've had a couple of YZ125s as well as a CR125. Not really interested in Suzuki for some reason which only leaves the KX and I don't have to much experience with them. If you were to build one, which would you choose?
Nice bike!
The Shop
kx had worst suspension stock wise but can be made to work(or swap some showas from a kx250f) it handled straights well and it cornered well too, on ground and air it felt very light
rm felt the tallest, is nimble and could carve turns, showa suspension was good but on the light side
yz was ok in handling nothing bad/good. of the three I would say it turned the worst but no by much, and suspension is the best stock
most "issues" can be cured with suspension work or suspension linkage (kx needs the rear dropped)
motor wise (stock) the rm is mid top power, it liked to rev, I also had a modified engine that had good power all over
yz has a well balanced engine with good bottom, I ran it with a PC pipe and it made it too pipey,(sac bottom) and I didn't like it, preferred stock or fmf
the kx had a really strong mid and was the only one that gained the most from a pipe silencer (it helped open to top)
I ran a shorty on every bike. never ran on a track where I didn't need the extra bottom from it
personally I've been more of a sucker form Suzuki's and they fit me better with the taller setup (5'10")
kx was opposite felt low and small
yz again middle of road closer to rm feel compartment wise
Pit Row
The newer 03 plus kx engine is a copy of the yz engine the power valve porting are a copy of the yz it also a good 5 pounds heavier than the yz. Suspension not even close to the yz stock and the yz makes better power. Sure you can mod the kx a fix the flaws thing I disliked the most on my kx was the lack of ground Clearance make sure your toes are pointing up.
First newer bike I've had in a long time when bottomed out I could feel my feet touch the ground it happened more than once and I don't have big feet!
Picked up the 539 one for 1k, have around 1k -1500 into it. Didn't go over kill, just the basics.
726 was 1300. Around 600 into it.
We didn't care about the power issue. They are just fun to ride, and fun to rebuild! Hope you have as much fun as we did with your project.
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