Description

Honda ST50, ST50K3, ST70, ST70K3 Parts Catalog

I’ve been turning wrenches for 28 years, and I’ve seen more ham-fisted rebuilds than I care to count. The root cause, every time? A parts list that doesn’t match the bike. You order a piston ring for a Honda ST50, and what shows up is for a ST70K3—or worse, some aftermarket junk that’s close but not close enough. That’s why you need the real thing: the factory Parts Catalog for the ST50, ST50K3, ST70, and ST70K3. This isn’t a repair manual—it’s a parts bible. 135 pages of exploded diagrams, Honda part numbers, and area-code-specific serial number breaks. If you’re rebuilding a carburetor, tracking down a cam chain, or replacing a crankcase cover, you need the correct reference numbers. End of story.

What This Parts Catalog Actually Covers

Open the table of contents and you’ll see 35 sections—starting with the cylinder head cover and spark plug (section 2) and running all the way through the tool set (section 35). Every major assembly is broken down. The camshaft (section 4), the cylinder (section 3—though really the head), the crankshaft and piston (section 9), the transmission (section 11), and the fuel tank (section 21). They’re all mapped out with part numbers and exploded views. Need a clutch pack? Section 7. Kick starter? Section 12. This catalog doesn’t leave anything out.

Area Codes and Serial Numbers Matter

Flip to page 2 of the PDF and you’ll see the model/area code table. Honda built these bikes with small differences depending on where they were sold—Belgium gets a different frame serial range than England or Germany. The catalog calls that out. If you have an ST70 with frame number ST70-124287, that’s a German-market bike, and you need to pay attention to the area code column. Aftermarket catalogs ignore this. Honda doesn’t. If you’re ordering a headlight or a winker assembly, that detail matters.

3 Systems That Cause the Most Ordering Errors

I’ve seen guys order the wrong carburetor gasket set because they didn’t read the ref. numbers. The carburetor section (14) lists each jet, needle, and float. The fuel tank (21) has separate part numbers for the petcock and cap. And the transmission (11) breaks down every gear, shaft, and bearing. If you’re chasing a shift drum issue, you’ll see the drum and forks listed individually. Don’t trust a third-party diagram that lumps them together. This catalog has the exact part numbers—no guesswork.

Why an OEM Parts Catalog Over Aftermarket

Aftermarket parts lists are copy-pasted from scanned photocopies. The numbers get blurred, the supersessions get dropped, and you end up with a piston that’s a millimeter too big. This catalog is a direct Honda PDF, 135 pages of clean line drawings and tables. The part numbers are primary—if a part supersedes, the note on page 2 says “the part number described under the part description superseded the part number ahead.” That’s factory documentation. You can trust it. Look at the Automotive Industry Overview for context on why OEM specificity matters in restoration work.

For serious rebuilds, pair this catalog with the service manual. Check out the HONDA ST50 Service Manual for torque specs and assembly steps. If you’re working on other Honda bikes, the Honda VFR750F 1994 Parts Catalog – OEM Factory Parts Breakdown and the Honda VFR400R VFR400Z 1989 Parts Catalog – OEM Factory Manual follow the same standard.

Does this catalog include repair procedures?

No. This is a parts catalog, not a service manual. It shows exploded views and part numbers. For assembly, get the factory service manual.

What years does it cover?

The PDF does not list a publication year, but the models are the ST50, ST50K3, ST70, and ST70K3. The frame serial numbers in the table go up to the late 1970s. It covers those specific variants.

How do I use the area code column?

Locate your bike’s frame number. Compare it to the model/area code table on page 2. If your ST50 has an area code “G”, you need the German-spec parts. Some parts are common-use (no area code), but others are exclusive to that market. Ignoring it can get you the wrong throttle cable or taillight.

Can I use this catalog for the ST70 Dax?

Yes, the ST70 and ST70K3 are included. The PDF file name itself says “Honda 70 Dax Parts Catalog ENG”. The Dax models share many parts with the ST50 series, but always verify the part number against the section that matches your specific model code.

You’re rebuilding a Honda mini-trail or Dax? Stop wasting time on aftermarket copies. Get the actual factory parts breakdown. Access the Factory Manual—it’s the only one that matches the bike on your lift.