2002 Kawasaki KX125 Two-Stroke Garage Build Bike Rebuild

Text: Kris Keefer
Build:Martin Castelo / worldmoto.co
Video: Spencer Owens
Photos: Spencer Owens
For this build, we hooked up with the recently retired pro racer Martin Castelo, who wanted to do a project while he recovered from wrist surgery. Martin spent the last six seasons racing Monster Energy AMA Supercross in 250SX for different teams, earning a handful of top-ten finishes along the way. He’s stepped away from pro racing to start his own World Moto motocross academy, where he coaches all different levels of riders, from top amateurs to 50cc kids. He’s also done a few international camps with the goal of bridging the gap between Latin America and the USA.
Wiseco Performance Products
Racer Elite Piston Kit, Clutch Basket, Clutch Pack Kit
wiseco.com
Pro X Racing Parts
Connecting Rod Rebuild Kit, Main Bearings and Crank Seals, Carb Rebuild Kit, Clutch Cable, Water Pump Rebuild Kit, Clutch Inner Hub, Clutch Pressure Plate, Front Wheel Bearing, Rear Wheel Bearing, Front Wheel Spacer Kit, Steering Bearing Kit, Front Brake Caliper Rebuild Kit, Rear Brake Caliper Kit, Front Master Cylinder Rebuild Kit, Rear Master Cylinder Rebuild Kit, Front Sprocket, Rear Sprocket Alloy, MX Chain Gold, Counter Shaft Seal Kit, Upper and Lower Chain Roller, Swing Arm Bearing Kit, Swing Arm Linkage Bearing Kit
pro-x.com
Klotz Synthetic Lubricants
R-50 Two-Stroke Pre-Mix and Chemicals
klotzlube.com
Faster USA
Complete Wheel Build from Stock Hubs
fasterusa.com
Specbolt Fasteners
Engine and Plastic Complete Bolt Kit, Sprocket Bolt Kit
specbolt.com
Cranks by Andrew Langston
Crankshaft Rebuild with ProX Rod Kit
@mxandrew1118
Twisted Development
Engine Rebuild
td-racing.com
San Diego Powder Coating
Sandblasting, Powder with Super-Durable Clear and Race Prep Masking
sandiegopowdercoating.com
Sano Metal Finishing
Vapor Honing and Cerakoting
sanometalfinishing.com
FMF Racing
Factory Fatty Exhaust, Shorty Silencer
fmfracing.com
Lectron
Lectron High Velocity Carb with Throttle Cable (comes pre-jetted)
lectronfuelsystems.com
Phathead Racing
Custom Engraved Cylinder Head with Race Dome
phatheadracing.com
Dunlop
MX33 Front and Rear
dunlopmotorcycletires.com
Uni Filter
Two-Stage Air Filter
unifilter.com
DeCal Works
Semi-Custom Graphics Kit, Preprinted Number Plates Backgrounds
decalmx.com
UFO Plastic
Full Plastic Kit with Updated Front Fender and Number Plate, Mud Flap
ufoplasticusa.com
MotoSeat
Custom Seat Cover
motoseat.com
Works Connection
Hour Meter and Mount, Stand, Front Brake Rotating Bar Mount, Steering Stem Nut, Brake Reservoir Cap, Elite Clutch Perch Assy, Oil Filler Plug, Fasst Co Rear Brake Clevis
worksconnection.com
MotoTassinari
V-Force Reed Cage
mototassinari.com
ODI
MX V2 Lock On Grips, CFT Handlebars McGrath Bend, Large Bar Mounts
odigrips.com
Race Tech
Suspension Re-Valve and Set Up
racetech.com
Galfer USA
Front And Rear Rotor, Brake Line Front and Rear, Brake Pads Front and Rear
galferusa.com
IMS
Foot Pegs
imsproducts.com
Cometic Gasket
Engine Gaskets
cometic.com
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[@motoguy7281]

I remember going to Budds Creek as a kid. Mike Browns Pro Circuit Kawasaki 125 was one of the nastiest sounding bikes I have ever heard and he loved to Rev it to the moon.

[@Doodlett]

Brownie was a bad dude on his 125 , best sounding bike indeed.

[@bobovv6060]

Coolest looking kawi ever. Kawi should take note the black seat and frame for stock design.

[@leonardwashington710]

I rebuilt a 02 KX125 last year and I love it, so much fun revving it out

[@jonruger]

I had a 2000 a few years back my first 125 since the 90s and it was a hoot forgot how much fun holding it WFO everywhere is. Ended up selling it to the neighbors kid and he learned to ride on it still loves it to this day

[@chrisvozza6530]

Yes very beautiful looking. I bet it runs as good as it looks

[@daltone6932]

Love the build

[@KUKI_de]

nice 🔥🔥🔥

[@phatheadracingmx]

Big thanks to Martin, Dirtbike TV, Keefer and Racer X! $1.25 Time for the 125 supercross edit!

[@rickrossi4468]

Kiefer that thing is a work of art. Brings back major memories of the 2 stroke days. Crisp and clean what a machine!!¡!!

[@user-nb9iw8br9k]

where did you get the plastics for front end

[@camandrews1]

Hey do you guys think this bike build can win at Loretta Lynn's or just buy a newer 125 or 150

[@Zingaro235]

Front fender and Number plate, tell me the model please 😊

[@derrickzenner9300]

My 02 kx125💚 still has everything original. I wish it had 10000 hours but I haven't even replaced a single thing on it yet. No time to ride. 50 hours maybe🤦‍♂️

[@sheenpink40]

Rebuild Every 6 hours na run it till she blows

[@tomvanheeswijk5560]

From what I see , I think it has to run better ….

[@d20297]

Sacrilege to put FMF exhaust on a Kawasaki.