Yamaha TW125 Parts Catalog – OEM Factory Parts & Diagrams

If you’ve ever ordered a part for a TW125 from an aftermarket catalog and ended up with the wrong piston or gasket, you know the frustration. I’ve been turning wrenches for 28 years and I’ve seen too many jobs delayed because someone trusted a third-party parts list. That’s why I keep OEM parts catalogs on my bench. This Yamaha TW125 Parts Catalog is the real deal – 57 pages of factory part numbers, exploded diagrams, and quantities. No guesswork.

Engine Breakdown: Cylinder Head to Crankshaft

This catalog splits the engine into logical groups. You get the Cylinder Head section with all valve components – keepers, springs, retainers. The Cylinder section covers the bore and piston ring sets. Crankshaft.Piston? It’s all there: crankpin, big end bearing, piston pin, circlips. The Valve and Camshaft.Chain chapters list every timing chain guide and tensioner part. If you’re rebuilding the top end, you’ll find the exact part numbers for the camshaft sprocket and chain slipper. The Oil Pump section gives you the rotor and housing parts. Intake, Carburetor, Exhaust – each has its own page with quantities. I’ve seen guys order wrong carb jets from aftermarket sources. Not with this catalog.

Chassis and Suspension: What You’ll Find

Frame, Fender, Side Cover – all the body parts are here. Rear Arm and Rear Suspension cover the swingarm, shock linkage, and springs. Steering and Front Fork list every bushing, seal, and bolt. Don’t forget the Fuel Tank – it’s in the Fuel section with the petcock and cap parts. Seat, Front Wheel, Rear Wheel, Brake Calipers – the whole rolling chassis. If you’re replacing a bent front fork tube, you can look up the exact inner tube part number instead of buying a whole assembly. The Rear Suspension chapter alone saves you from buying the wrong shock absorber bushings.

Transmission and Clutch: Part Numbers You Can Trust

Clutch section has everything – friction plates, steel plates, springs, push rod, release bearing. Transmission lists every gear, shaft, and bearing. Shift Cam.Fork and Shift Shaft cover the shift drum, forks, and shift pedal components. Need a specific gear for the transmission? The part number is right there. I’ve had a customer bring in a TW125 with a broken shift fork. Aftermarket catalogs showed a fork that looked right but was 2mm off. This OEM catalog gave me the correct fork number. No returns, no downtime.

Why OEM Documentation Beats Aftermarket Copies

Page 4 of this catalog includes the foreword with instructions on how to read part numbers and the note that modifications are announced in Yamaha Parts News. The aftermarket reprints don’t have that. They copy illustrations but miss the revision notes. This is an official Yamaha Motor Co., Ltd. publication – 1st Edition, Oct. 2001. The illustration on page 4 shows exactly how the model label is affixed to the frame. You cross-reference the model code (5RS1) and production code number. That’s how you know you’re ordering parts for the European TW125, not some generic version. The catalog even breaks down country codes like Austria, England, Italy. No third-party catalog does that.

This is the same document dealership parts counters use. It’s not a copy of a copy. The Numerical Index at the end lets you find a part by its number if you’ve got an old part in hand. For electrical components, there’s a Generator, Starting Motor, Flasher Light, Meter, Headlight, Taillight, and Handle Switch.Lever section. The Electrical 1 chapter covers the main wiring harness connectors. If you’re restoring a TW125 and need the correct starter motor brushes, you’ll find them here.

Who Needs This Catalog?

DIY mechanics doing a full engine rebuild. Home garage enthusiasts swapping a crankshaft or valve job. Owners tracking down rattles in the rear suspension. Beginners who want to order the right fuel filter the first time. If you own a TW125 (5RS1) and plan to keep it running for another 20 years, this catalog is your parts bible. It’s 57 pages – compact enough to print and toss in the toolbox. No wasted space. Every illustration has a list of part numbers with quantities. The ‘AP’ and ‘LM’ codes tell you if a part has an alternate or is locally made. That’s info you won’t find in a generic microfiche download.

I also recommend pairing this with the service manual, but that’s a separate document. For parts ordering, this is the one. Check out the related factory catalogs for other Yamaha models: Yamaha YZF-R1 2002 Parts Catalog – OEM Factory Part Numbers, Yamaha GTS1000AE 1993 Parts Catalog – Factory Microfiche PDF, and Yamaha V125 Parts Catalog – OEM Factory Part Numbers & Diagrams. For a broader understanding of how internal combustion engines work, read Internal Combustion Engine. And if you’re curious about the automotive industry’s reliance on OEM documentation, see Automotive Industry Overview.

Does this catalog include torque specs or repair procedures?

No. This is a parts catalog, not a service manual. It has part numbers, quantities, and exploded diagrams. You need the service manual for torque values and step-by-step repairs.

Can I use this catalog to rebuild the entire engine?

For ordering parts, absolutely. The Engine section covers everything from Cylinder Head and Camshaft to Crankcase, Clutch, and Transmission. But the catalog won’t tell you how to assemble it – that’s what the factory service manual is for. However, if you have both documents, you can rebuild the engine with confidence that every part you order matches Yamaha’s spec. The Suspension and Fuel sections are equally detailed for chassis work. I always keep this catalog open when I’m ordering gaskets, bearings, or any internal engine part for a TW125.

Bottom line: if you need to order parts for a Yamaha TW125, stop relying on aftermarket websites that show generic drawings. Get the factory documentation. Download the Factory Manual now and start ordering parts the right way.