We believe 125s and low cost two-strokes are good for our sport, and with a bit of a revival going on with the 125 Dream Races and efforts in Lucas Oil Pro Motocross, we know these bikes are still capable of great racing when raced against other 125s. For this latest build, Jay Clark found a blown-up 2004 RM125 that needed some love.

The cylinder was taken off because of damage, and the air boot/carb were both so full of dirt and mud you could plant a garden. So, with a cylinder shipped off to Millennium for a full repair and the Vertex Piston, he was set to do the rest of the work: powder-coat the frame, rebuild all important bearings and seals, and rebuild the entire bottom end with the Wrench Rabbit kit. All-Balls kit was used on the carb with a new Fuel Star Petcock to help ensure good fuel flow.

Jay figures that for under $1,000, you can repair the engine and cylinder if you do the work yourself. Then for another $1,500, get your frame, wheels, and suspension all gone over. For under $3,000 on top of the $400 investment of the blown-up bike, we have a beautiful machine. Jay didn’t build this to go race against former pros chasing their glory days; there was no big bore and no porting done. This is meant for a beginner to novice rider to get into riding and do so cheaply.

This project shows you can fix up your dead 125 laying in the barn.

The Wrench Rabbit kit has all you need to do it right; Vertex Piston, Hot Rods Crank and bearings along with the gaskets to do the job completely.

OTHER HIGHLIGHTS

Re-worked Wheels by Faster USA
Powder Coated Frame from San Diego Powder Coating

WRENCH RABBIT     

www.wrenchrabbit.com
Full rebuild in one box (four stroke kits include cam chain)

HOT RODS

Complete Bottom end kit  Includes complete crankshaft, main bearing seal kit and complete engine gasket kit. Also includes transmission bearings.

VERTEX PISTONS

Pro Replica Piston kit  (ring, pin and clips)

MILLENNIUM TECH

www.mt-llc.com
Strip, re-pair damage and re-plate to stock size

FMF RACING

www.fmfracing.com
Fatty exhaust
Shorty Silencer

SUPERSPROX                                   

www.supersproxusa.com
Rear alum Sprocket 53T
Front Sprocket   13T
MX Chain

ALL-BALLS

www.allballsracing.com
Carb Rebuild kit
Throttle Cable
Clutch Cable

UNI FILTER

www.unifilter.com
Two-Stage air filter

HINSON CLUTCH COMPONENTS        

www.hinsonracing.com
Basket, hub and pressure plate
Fibers, steels and springs clutch kit

FASTER USA            

www.fasterusa.com
Stock hubs treated and rebuilt with new spokes and Excel rims

FASST CO

www.fasstco.com
Rear Brake Clevis

FUEL STAR

www.fuel-star.com
Fuel Valve Assy with hose

UFO PLASTIC            

www.ufoplasticusa.com
Full plastic kit

SAN DIEGO POWDER COATING                

www.sandiegopowdercoating.com
Sandblasting, powder with superdurable clear, and “race prep masking’

MOTOTASSINARI

www.mototassinari.com
V-Force Reed Cage

PIVOT WORKS

www.pivotworks.com
Steering stem bearing kit
Linkage rebuild kit
Swing arm rebuild kit
Wheel Bearings

RENTHAL

www.renthal.com 
971 Handlebars
Dual compound grips

DUNLOP TIRE                            

www.dunlopmotorcycle.com
MX3S front  80/100-21
MX3S Rear 100/90-19

MOTION PRO             

www.motionpro.com
Grip Glue
Titan throttle tube

MOTO SEAT                              

www.motoseat.com
Custom Cool seat cover

WORKS CONNECTION

www.worksconnection.com
Elite Clutch Perch
Brake Caps
Front Brake lever
Oil filer Plug

MOTOMASTER

www.moto-masterusa.com
Front oversized and rear rotor
Front and rear Brake pads

SAN DIEGO POWDER COATING

www.sandiegopowdercoating.com
Sandblasting, powder sparkle silver with superdurable clear, and “race prep masking’

TUSK

www.tuskoffroad.com
Front & Rear Steel braided brake line
Chain Blocks

KLOTZ SYNTHETIC LUBRICANTS              

www.klotzlube.com
R-50 Two-Stroke Pre-Mix

TM DESIGNWORKS

www.tmdesignworks.com
Chain guide and chain block

CV4

www.cvproducts.com
High Pressure Radiator Cap
Carb Vent hoses
Radiator hoses

PRO MOTO BILLET/FASTWAY      

www.promotobillet.com
Footpegs

FACTORY CONNECTION

www.factoryconnection.com
Suspension rebuild and service

VP FUEL

www.vpracingfuels.com
C-12 Fuel mixed with pump