This is a curated list of reputable, somewhat lesser-known parts suppliers for SOHC Honda motorcycles (CB / CL / SL, 1968–1978), plus a small section for CT trail bikes & Passports / Supercubs. I don’t sell parts - this page exists to save searching time, and give you one resource to bookmark.
Classic Honda Restoration - Specializes in parts for 305 Honda motorcycles - CA72/CA77, CB72/CB77, CL72/CL77.CMSNL - Huge inventory of OEM parts, could be considered a baseline supplier, but a unique one that's excellent for parts diagrams / part numbersCommon Motor Collective - Excellent resource for Honda Twins - CB175 / 350 / 360 / 450 and the CB500 Four.David Silver Spares - This link is for the US based warehouse / supplier. Huge selection of NOS and remanufactured parts.NOS Parts Now - Often premium pricing, but sometimes the only option for very specific NOS parts.Old Bike Barn - Independently owned, based in Ohio, real people answer the phone.Scrambler Cycle - Not a ton of personal experience here but well regarded on forums, and sometimes has a key part or two you can't find anywhere else.VintageCB750 - Really good CB750 specific resource - based in Canada but ships fast and cheap to US.z1 Parts - Big in the Kawasaki scene but a cool collection of Honda parts - another great place to search for that 1 hard to find item.4into1 - Large selection of parts across many models. Ships out of CA. Great when you need a mix of OEM and Aftermarket / Replica parts.
Molded Rubber Parts & Tank Emblems: Clauss Studios
Spokes & Rims: Buchanan's
Wiring, Terminals, and Connectors: Cycle Terminal or Vintage Connections
Electrical Doodads and Custom Wiring Harnesses: Sparck Moto
Bolts, Screws, JIS Fasteners: Bolt Depot or Bolts & Nuts
Fork Tubes: Frank's Forks
Plating & Tank Sealing: Caswell
How-To Books & General Info Blog: The Motorcycle Project
CTTrailBikes
DrATV
Northeast Vintage Cycle
Treatland
TrailBuddy
Vintage Honda Mini Trails
Places you've probably already heard of, but are sometimes the easiest / fastest options
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Partzilla
Dime City Cycles / Randakk's Cycle Shack
Interesting trove of S90 Information: Barney's Journal
Info about S90 parts over different sales years: S90 Parts Puzzler
Misc Restoration Info: Vintage Bike Builder
I don’t sell parts — this site links to reputable suppliers and resources. In some cases I may use affiliate links, but suppliers are listed in alphabetical order and I don't sell placements.