resources

Vintage Motorcycle Mailing Lists

The VinMoto mailing lists are excellent sources of information and local expertise and advice.

Honda General Manuals

Common Service Manual [pdf - 66MB]
Motorcycle Carburetion [pdf - 31MB]
Motorcycle Electrical Systems [pdf - 183MB]

Honda CB350

honda-cb350-twin-shop-manual (K1-G models) [pdf - 34MB]
Honda CB250 CL250 CB350 and CL350 Workshop Manual (© 1969) [pdf - 28MB]

CB350 Wiring Diagram [jpg]

1968 CB350 parts fiche [zip - 1MB]
1970 CB350K2 parts fiche [zip - 1MB]
1971 CB350K3 parts fiche [zip - 1MB]
1972 CB350K4 parts fiche [zip - 1MB]
1973 CB350G parts fiche [zip - 1MB]

There are two online communities dedicated to Honda twin-cylinder motorcycles - including the CB350 - hondatwins.net and hondatwins.com.  The former is quite active while the latter is all but dead.

I prefer the Clymer manual over the Haynes manual but having at least one of these is a necessity.

Here's a CB350 blog that features a detailed carburetor rebuild walkthrough. You can also check out benmiranda.com/my-honda-cb350 for more information on CB350 carburetors and jets.

Honda CB750

1982-CB750C-owners-manual [pdf - 4MB]
Honda-1979-1983-CB750-DOHC-Service-Manual [pdf - 58MB] 

Honda CB750C DOHC Wiring Diagram [jpeg]

1980 CB750C parts fiche [zip - 1MB]

For DOHC models, check out cb750c.com. For earlier models, try sohc4.net. Either or both of the Clymer or Haynes manuals are strongly recommended.

Other Wiring Diagrams

A post on bikechatforums.com has a huge collection of wiring diagrams for all sorts of motorcycles and scooters.

Parts Suppliers

Power Barn [Wisonsin]
Bore Tech [Ohio]
North City Vintage Honda [Washington]
Sirius Consolidated [Ontario]
Motorcycle Solutions [Wisconsin]
Western Hills Honda [Ohio]

the definitive word on CB350 gasket kits

There are quite a few gasket kits available that claim to have every gasket for the CB350.  This is a lie.  The list below identifies every gasket used in the CB350 engine and shows which gasket sets contain each.  This is a work-in-progress.  Suggestions/corrections/additions are welcome.  Anything in italics is something that I have not verified first hand.

Gasket Kits

ID Manufacturer Manufacturer Model # Vendor Vendor Model #
DK D&K 6888 Sirius Consolidated CB350GS
A Athena unknown Bore Tech GS350
AT Athena unknown Bore Tech TEGS350
NE NE BRAND unknown Rusty Riders ga-58-3346
V Vesrah VG-145 unknown unknown

Notes

  • Rusty Riders advertises the Athena kit, but actually sells the NE BRAND kit!
  • The gasket kits shown here are ones that I've been able to identify as "readily available."
  • I have only seen one NOS gasket kit.  It contained some parts that are not found in any of the new kits (oil pump gasket and vibration dampeners for the cylinder head).  However, the gaskets were in terrible physical condition.  They were rigid and none were flat.

Gasket Kit Contents

Name Location Part Number Required DK A AT NE V
GASKET, CAM CHAIN TENSIONER HOLDER CAM CHAIN TENSIONER 14592-286-310 1 1 1   1  
GASKET, EX. PIPE CB MUFFLER 18291-286-000 2 2 2   2  
GASKET, CYLINDER CYLINDER - PISTON 12191-312-000 1 1 1      
O-RING (69.8X2.0) CYLINDER - PISTON 91304-287-000 2 2 2 2    
GASKET, INSULATOR CYLINDER HEAD 16229-369-306 2 0 2   0  
GASKET, CYLINDER HEAD CYLINDER HEAD 12251-312-004 1 1 1      
GASKET, CAM CASE CYLINDER HEAD COVER 12261-286-030 1 1 1      
GASKET A, CYL HD CVR CYLINDER HEAD COVER 12391-286-010 1 0 1      
GASKET B, CYL HD CVR CYLINDER HEAD COVER 12394-312-000 1 0 0   0  
GASKET C, CYL HD CVR CYLINDER HEAD COVER 12395-286-000 1 1 1  

 

  
O-RING (30.8MM) CYLINDER HEAD COVER 91302-001-020 4 4 4      
GASKET, CYLINDER HEAD SIDE COVER CYLINDER HEAD SIDE COVER 12392-286-050 2 2 2      
GASKET, POINTS COVER CYLINDER HEAD SIDE COVER 30372-286-320 1 1 1      
GASKET, L. CRANKCASE COVER LEFT CRANKCASE COVER 11395-286-040 1 1 1      
GASKET, ALTERNATOR COVE LEFT CRANKCASE COVER 11691-286-000 1 1 1      
GASKET, OIL PUMP OIL FILTER + OIL PUMP 15291-286-300 1 0 0      
GASKET, R. CRANKCASE COVER RIGHT CRANKCASE COVER 11394-286-040 1 1 1      
MYSTERY GASKET UNKNOWN UNKNOWN 0 1 0      
Valve Seals     0       4  
MYSTERY SEALS     ?       2  

Notes

  • The part numbers are taken from the CB350K4 parts fiches.  In cases where more than one part number exists, I have chosen one at random.
  • In some cases, Honda seems to use the term "gasket"  for rubber pieces, similar to o-rings or seals, that are used in the front forks or taillights.  These are not included here.
  • Most gasket kits include o-rings for the cylinder bases and tappet covers.  These are included here.
  • Some gasket kits include valve stem seals, despite the fact that they are not included in the Honda parts fiche.  These are included here, but they are not required.
  • "GASKET B, CYL HD CVR" is a metal plate.  I am not sure why Honda considers this to be a gasket.  It is not included in any gasket kit that I've seen, but is included here.
  • I believe that Mystery Gasket #1 can be used for the oil filter cover on the right crankcase.  It is not included in the Honda parts fiche.