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748
Joined
10/6/2010
Location
Morehead city, NC
US
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
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Free shipping: VITALMX
Luxon 4-Post Bar Mounts
$189.95 - $239.95
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.
We just finished completely rebuilding a 2003 KX125 from the frame up for my son. We race the Southern Off-Road Championship Series, www.sorcs.net, and several GNCC's. He races for Team Kawasaki of Statesboro. He's moving up from the mini class and coming off a 2015 KX100. He's only 14 but 5'10" so he out grew mini's. We thought he was going to move up to a 2015 KX250F. He started practicing and doing a few races on my KX250F and he was doing OK, complained about the weight and not being able to "flick it around". He borrowed a friends RM125 and DESTROYED our test track and came back with a huge grin on his face. I went and bought a donor KX125 that week for 850 bucks, RUNNING!!
Total frame off restoration. Sent motor to Eric Gorr to upgrade it to a 144. We added a 7oz flywheel weight. Brand new Hot Rods crank and bottom end. Sent suspension off to Factory Connection. Pro Circuit exhaust with shorty 304. IMS over sized tank. EVERY bearing, nut, bolt, washer, and hose replaced. Powder coated frame. Polished swing arm. All new Works Connection controls. All new plastics with updated 2016 front fender and number plate with custom graphics. Boyesen magnesium clutch and ignition covers (not pictured because of back order status) New set of DNA wheels, black with green hubs.
www.sorcs.net
https://www.facebook.com/teamkawasakiofstatesboro/?fref=ts
Here are a few pics and some videos of testing.
https://youtu.be/7oJmpu-29P4
https://youtu.be/rCk0X3dxNU8
Thanks,
Jimmyb
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