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Racer X Tested: Yamaha YZ 125

Film/Edit: Donnie Bales

As everyone knows the YZ125 is one of our favorite bikes for many reasons. The main reason is simply that the bike is just a ton of fun to ride. So, making it a bit faster can only make it even more fun. Sit back and enjoy some good two-stroke sounds.

Nearly every major product for this project can be obtained directly from Rocky Mountain ATV/MC: 800-336-5437

Tom Morgan Racing 949-421-7112

Cylinder Porting

Head mod 

Vertex Pistons 515-270-2302

Complete Piston kit

Cometic 800-752-9850

Top-EndGasket Kit

FMF Racing 310-631-4363

Fatty chrome

Shorty Silencer

MotoTassinari 603-298-6646

V-Force 3 Reed Valve

Renthal 877-736-8425

Front and rear Chain Wheels

Fat Bar 604 Bend

Works Chain


Uni Filter 714-535-6933

Two-Stage Air Filter

Dunlop Tire  800-845-8378

MX51 front

MX 51 rear

Tusk 800-336-5437

Oversized Typhoon front rotor kit

Works Connection 1-888-224-8718

Elite Clutch erch

Factory-4 Stand with extra bumps

Hour Meter and Mount

CV4 800-874-1223

Formed Silicone Coolant hoses in Blue

High pressure radiator cap

VP Racing Fuels 210-635-7744


DeCal Works 815-784-4000

Semi-Custom Graphics kit with #’s

Moto Seat 951-258-5229

Custom Cool seat cover

Rad MFG. 435-574-2537

Rad complete Signature wheel set

Klotz Synthetic Lubricants 800-242-2489

R-50 Two-Stroke Pre-Mix

Race Tech 951 279 6655

Suspension re-valve