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Yamaha YZ125
Off-road Motorcycle · YamahaParts guide1974–2026

Yamaha YZ125 OEM Parts by Year and Repair Job

Find Yamaha YZ125 parts in stock by job, from engine service and fuel to wheels, brakes and controls, plus teardowns and commonly searched parts.

5 min read · Nov 10, 2026

YZ125
1,266parts in stock
18 used OEM →
Brands carried
12brands

The YZ125 at a glance

Choose Yamaha YZ125 OEM parts for a factory replacement, used OEM when the original takeoff and its part note suit the repair, or aftermarket when a rebuild kit or setup better fits the work.

The Yamaha YZ125 year range here runs from 1974 to 2026.

Pick the job below, check fitment for your exact year, make and model, and ask PirateMX before ordering if the product page does not state the contents or details you need.

What YZ125 owners search for

Most searched for the Yamaha YZ125

  1. 01Top End Rebuild KitShop top end rebuild kit for the Yamaha YZ125
  2. 02CarburetorShop carburetor for the Yamaha YZ125
  3. 03PistonShop piston for the Yamaha YZ125
  4. 04CrankshaftShop crankshaft for the Yamaha YZ125
  5. 05Front WheelShop front wheel for the Yamaha YZ125
  6. 06Clutch CoverShop clutch cover for the Yamaha YZ125
  7. 07Reed ValveShop reed valve for the Yamaha YZ125
  8. 08Rebuild KitShop rebuild kit for the Yamaha YZ125

Engine and transmission

Keep the YZ125 running: engine and transmission

A Yamaha YZ125 top end rebuild kit is for cylinder-side work.

Start with Top End Rebuild Kits for cylinder-side work. Use Pistons & Rings for a piston repair, Engines & Parts for individual motor pieces, and Transmission & Parts for gear or shifting work. Choose Bottom End Rebuild Kits for crankshaft-side repairs, or Complete Engine Rebuild Kits when the top end and bottom end are both open.

Before ordering, decide how far the motor needs to come apart and check whether the product page includes the gaskets, bearings, piston, crankshaft or other pieces the repair needs.

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Top End Rebuild Kits for the YZ125

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Fuel and air

Fuel and air for the YZ125

A Yamaha YZ125 carburetor job starts under Carburetors.

Fuel Systems & Delivery covers the rest of the fuel path, Throttle Bodies applies when that assembly is being serviced, Air Intake & Filters handles the inlet side, and Reed Valves & Assembly covers a Yamaha YZ125 reed valve repair.

Match the replacement to the system being serviced, then check the product page for the stated contents and connections before adding related parts.

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Carburetors for the YZ125

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Tires and wheels

YZ125 tires and wheels for track and trail

Split Yamaha YZ125 wheel work into front and rear.

Use Front Tires and Rear Tires for the correct end, while Tires & Tubes covers replacement rubber and tubes. Motorcycle Wheels and Wheels & Rims cover the hard parts. Wheels Tires & Tubes covers Yamaha YZ125 front wheel or rear assembly work for track day prep and trail riding.

Buy tires new, then compare the product page's wheel, rim, tire and tube dimensions and included items with the parts coming off the bike.

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Front Tires for the YZ125

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Drive, belts and clutch

YZ125 drive and clutch for race prep

Race prep starts with the worn part.

Use Clutch Covers for a Yamaha YZ125 clutch cover and Clutch Parts for internals. Drivetrain covers broader power-transfer work, while Chains & Drive Belts and Sprockets & Pulleys cover the final drive. Guards & Guides may limit damage to covered parts in some impacts, but they cannot prevent every failure.

Separate cover, clutch-internal, final-drive and guard work, then compare the product page's included parts with everything being replaced during race prep.

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Clutch Covers for the YZ125

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Cooling

YZ125 cooling before riding season

Cooling leaks need a precise starting point.

Use Rebuild Kits & Seals for a Yamaha YZ125 rebuild kit or seal job. Engine Cooling covers the working cooling component, while Guards Covers & Shrouds covers outer pieces. A guard or shroud may limit damage to covered hardware in some impacts, but it cannot prevent every leak or crushed part.

Trace the leak or damaged area first, then review the product page to see which seals, cooling pieces or mounting hardware are included.

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Rebuild Kits & Seals for the YZ125

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Suspension and steering

YZ125 suspension and steering checks

A leaking seal or damaged Yamaha YZ125 fork tube points to Forks Tubes & Seals.

Suspension & Steering handles broader chassis work, while Swingarms, Steering Components, Steering Stems & Columns, and Ball Joints Bearings Bushings cover the remaining pivot, stem, bearing and bushing jobs.

Measure the removed part where the job calls for it, then compare the product page's dimensions, position and included hardware against the bike.

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Forks Tubes & Seals for the YZ125

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Brakes and cables

Brakes and cables for the YZ125

Start Yamaha YZ125 brake work at the failed component.

Brake Master & Slave Cylinders covers master and slave cylinder work, while Brakes covers broader system repairs. Brake Rotors & Bolts, Brake Calipers & Bolts, and Brake Pads separate the main stopping parts. Brake Covers & Guards may limit damage to covered hardware in some impacts, but they cannot prevent every bend or break.

Order Brake Pads and the other braking components new, then match the product page's mounting position, attachment details and included hardware to the bike.

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Brake Master & Slave Cylinders for the YZ125

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Controls, lights and gauges

YZ125 controls for rider contact points

A broken Yamaha YZ125 handlebar lever needs the correct side.

Handlebar Levers & Perches and Handlebars Controls & Levers cover bar-mounted parts. Foot Controls Levers & Guards covers lower controls, while Pegs & Floorboards covers rider footing. Handlebar Hand Guards & Barkbusters may limit damage to levers and controls in some tip-overs or impacts, but they cannot stop every break.

Verify the product page's side or position, mounting setup and included hardware before replacing the lever, foot control, peg or hand guard.

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Handlebar Levers & Perches for the YZ125

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Brands we carry

Shop the YZ125 by brand

Frequently asked questions

When should I look for a used OEM YZ125 part instead of a new replacement?

Look for used OEM when you need a factory takeoff and its part note shows it suits the repair. For top end or bottom end work that needs fresh wear parts, a new rebuild kit is usually the cleaner choice because you can match the included gaskets, bearings, piston or crankshaft to the job. Buy tires and brake pads new. Check fitment for your exact year, make and model before ordering.

Can't find the part for your Yamaha YZ125?

See every part we list: Yamaha YZ125 parts, plus body, plastics and frame and exhaust.

Check the year, make and model on each listing before you order.

Can't find it? Request a part and tell us exactly what you are looking for.

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