Racer X Films: 2003 Kawasaki KX125 Build

This 2003 KX125 was in great shape and a perfect find for a project bike. The frame paint on this bike looked like it was brand new. We can only imagine that whoever owned this bike rode it around a few times, fell over and scraped his elbow and then sold it. To us, God bless that guy. We didn’t go crazy with modifications on this bike because we wanted to keep it reliable and easy to tune. The crazier you get with cylinder and head mods, the fickler the jetting becomes. This machine took us right back to 2003 and reminded us just how fun this bike was.

[endlessprogression]

All these 125 build videos have made it impossible to buy a 125 in Washington lol keep it up tho love these RacerX build reviews!!

[jaydanmcqueen]

Probably the most crisp sounding 125 I’ve ever heard 🥺😍

[davidgripenberg]

I have an 04. PC jetting is perfect! With a PC suspension, they recommend 5mm fork height( stock 15mm). The bike handles amazingly with this change. I also went up one tooth on the rear sprocket to tighten the gear ratio. Parts are easily accessible. Acerbis has full plastic kits and chain slider/guides available.

[witepwrSS]

Sounds perfect I think that's the most dialed in I have heard ! Also that smile on pings face after the ride Just golden

[tat-isof]

Dude I want that bike so bad. Had a 01 yz125 and always wanted a kx

[smxpro]

I remember when I turned pro in the 125 class and you had to keep them pinned the whole time or they would fall on there face. Nothing like todays 4 strokes you can lug around and the huge torque will pull you through.

[zakcourt]

Yeah man thanks I have been waiting for the is 125, it looks very similar to my own 03 kx 125👍

[moto]

Man I love 2 strokes. Sounds like my done up yz125.

[Hot-Dog-Racing]

I had two of these. Such fun bikes. And good choice on the suspension!

[herdfreak]

David Pingree is a great guy, always enjoy his input!

[BigMxRadio]

Modern front end on the kx is always a pet peeve.. Nice Build tho.

[mikeowens]

My sons is a 03, I wish I could up load a before and after pictures. It was a fun project

[OSCARRODRIGUEZ-qiyd]

Ojala un dia regresen a las carreras puras motos de 2T. su sonido el hermoso y es el mejor.

[christophervillarreal]

DAMN you guys paid 3 grand for that! I got a 05 with 10 hours total for 1500... must be nice to have money to blow like that lol man I'll catch up soon enough guys!

[witepwrSS]

This bike sounds soooo good soooo so good

[chadclark]

I want a 92 kx125, probably have to buy a frame and do a ground up build. Vintage mx racing is how gen-x deals with midlife crisis, why can't we get re-release of these? MW2 is coming....some companies recognize potentially profitable to retro, now back to watching Roseanne, chill on that Netflix.

[alexzanderarmstrong]

IMS makes pegs for them got them on my 03 250 :)

[bugsbee]

nice ride... bought mine new for $3500 in 2003, still worth 3k lol

[keithtarrier]

Cool.

What do you do with these bikes after making the video? Sell them?

[andresarango]

I have an 05 kx125 next time you go to milestone let me know I will bring it, I can definitely use the help building it better