Honda-SOHC

Required      Service Honda   In Vesrah Top/Bottom   Aftermarket Replacement
   Transmission                     
1   91202-426-003   OIL SEAL (12X25X4.5)    gearshift drum seal   $3.21     
1   91202-KFL-841   OIL SEAL (13.8X24X)    gearshift seal   $3.20     
1   91205-283-015   OIL SEAL (33X57X7)   countershaft (output sprocket seal)   $6.43     
1   91207-374-000   OIL SEAL (34X8)   seal plug (discontinued)   $7.90     
1   91306-703-000   O-RING (24.5X1.5)    internal oring on countershaft (disc'd)   $1.96     
                       
   Cylinder @ Head                     
1   91256-096-651   OIL SEAL (4.8X14.5)    tach seal    $3.08     
6   91318-300-013   RUBBER, SEALING    head nut seal   $16.68     
8   91301-200-000   O-RING (10X1.6)    valve guide oring   $15.44   x   
2   91301-426-010   O-RING (4.9X2.5)    head dowel oring   $2.56   x   
8   91302-001-020   O-RING (30.8MM)    tappet oring   $17.92   x   
4   91302-001-020   O-RING (30.8MM)   intake manifold oring   $8.96   x   
4   91304-286-000   O-RING (61.8X2.0)    cylinder sleeve oring   $21.52   x   
2   91310-426-000   O-RING (11X2.5)    cylinder to case dowel oring   $6.00   x   
1   91310-426-000   O-RING (11X2.5)    tach oring    $3.00   x   
4   91319-323-000   O-RING (6X3)    rocker shaft cover oring   $6.12   x   
1   12191-426-306   GASKET, CYLINDER    cylinder to case gasket   $12.60   x   
1   12251-374-306   GASKET, CYL HD    head gasket   $57.32   x   
1   12329-323-000   GASKET, BTHR CVR   breather cover gasket   $6.99   x   
1   12391-323-000   GASKET, CYL HD CVR    rocker cover gasket   $30.56   x   
4   18291-390-306   GASKET, EX. PIPE   exhaust pipe gasket   $17.48   x   
                       
   Crankcase @ Oil Filter                     
1   91301-MY9-003   O-RING (15X2.5)    oil filter bolt oring   $0.85     
1   91316-425-003   O-RING (89X4.5)    oil filter housing oring   $2.57     
1   91319-300-000   O-RING (13X2.5)   oil passage plug oring   $3.22     
3   94608-40000   O-RING (19.4X2.8 )    oil passage plug oring   $2.10     
1   11398-426-000   GASKET, OIL PAN    oil pan gasket (aka oil pump gasket?)   $6.06     
                       
   Clutch @ Crankcase                     
1   91204-286-003   OIL SEAL (18X29X7)    kick start seal?   $2.57     
1   91259-VM0-000    OIL SEAL (10X16X4.5)    outer clutch lever seal   $1.80     
1   91301-704-000   O-RING (6MM)    inner clutch lever oring   $1.62     
1   91354-371-000   O-RING (23X2)   dipstick oring   $1.85     
1   11394-390-306   GASKET, R. CRANKCASE    clutch cover gasket (disc'd)   $8.96   x   
1   30372-300-300   GASKET, POINT COVER   point cover gasket          $5.89   x   
           
           
   Camshaft @ Crankshaft                     
8   12209-333-005   SEAL, VALVE STEM    valve stem seal   $47.52   x   
1   91201-300-003   OIL SEAL (30X42X8 )    crank shaft oil seal, rotor side   $7.24     
1   91201-323-005   OIL SEAL (30X45X8 )   crank shaft oil seal, points side   $8.34     
1   91305-323-000   O-RING (5.8X1.9)    cam chain tensioner o-ring   $1.76   x   
                       
   Alternator @ Oil pump                     
2   15155-323-000   COLLAR, O-RING    oil pump collar (discontinued)   $1.82     
2   31206-402-008   O-RING (60X1.4)    oring in starter   $8.16     
2   91301-268-020   O-RING (13.6X2.4)    oil pump collar oring   $3.36     
1   91302-250-010   O-RING (47X3.2)   oil pump to case oring   $4.20     
1   91312-MG7-003   O-RING (24.4X3.1)    starter to case oring   $3.51     
1   94608-40000   O-RING (19.4X2.8 )    oil passage cap on pump oring   $0.70     
1   11691-323-306   GASKET    alternator cover gasket (aka dyno gasket?)   $7.19   x   
1   31282-323-300   GASKET, START MTR CVR   starter motor cover (disc'd)      x   
           
   Oil Pump Internal         
1   91305-426-003    O-RING (46x2)    oil pump cover   $4.13     
2   91302-377-000    O-RING (15x2.5)    suction and feed     $6.82     
           
   Carburetor                     
4   16010-323-305   GASKET SET    gasket kit, 1 per carb   $48.68     
           
   Fuel Tank         
1   16950-393-015   PETCOCK ASSY.   petcock assembly   $41.43     
1   16952-388-015   SCREEN SET   $21.25     
1   17534-323-300    GASKET    filler cap         
           
   Wheel         
1   DUST SEAL (22X36X8) 91252-300-003 Front wheel dust seal   6.01      AllBalls 30-3601
1   Front wheel seal #2         AllBalls 30-5009
1   OIL SEAL (34X55X9) 90753-283-000 Rear wheel dust seal   8.97      AllBalls 30-5502
           
           
Required           
   Camshaft @ Crankshaft               
8   Multiples  Connecting Rod Bearings         
10   Multiples Crank Bearings         
                   
   Front Wheel @ Rear Wheel               
2   96140-63020 Front Wheel Bearing 6302U         AllBalls 6302-2RS
1   96140-63040-10 Rear Wheel Bearing #1 6304U         AllBalls 6304-2RD-QE6
1   96140-63050-10 Rear Wheel Bearing #2 6305U         AllBalls 6305-2RD-QE6
                   
   Transmission @ Kickstart               
1   23931-323-004 Main shaft gear needle bearing (disconitued)         
1   25100-374-003 Oil pump bearing (discontinued)         
1   91002-KY4-901 Primary shaft left side bearing 63/22         
1   91002-283-000 Countershaft bearing 5205         
1   91002-286-008 Mainshaft bearing 5205HS (disconitnued)         
1   91007-323-000 Gear needle bearing (disconitued)         
1   91008-374-003 Shift drum bearing 16005         
1   91022-374-003         
1   96100-62050-00 Primary Shaft right side bearing (6205)         
* CB550 Seals - Gaskets - Bearings.xls (29 kB - downloaded 300 times.)
« Last Edit: March 14, 2011, 04:37:01 pm by q2418130103p »
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Check out my CB550 project thread:
http://forums.sohc4.net/index.php?topic=83097

https://r.tapatalk.com/shareLink/topic?url=http%3A%2F%2Fforums%2Esohc4%2Enet%2Findex%2Ephp%3Ftopic%3D82355%2E0&share_tid=82355&share_fid=13548&share_type=t&link_source=app

Did you instruct on the hazards of mercury when the mercury arc rectifiers got broken or scrapped?
Heard stories of the floors of control rooms having tiny globules of mercury sloshing about.

Closest I can find in Xring is 12.42 x 1.78

Cheers ... I need to check with USA site as somebody used Viton ™   and that was thinner than 2mm because of the increased hardness (i.e. 75° as compared with nitrile 70°).

The 'O' section ones in Nitrile are available here in packs of 6 ... The same firm that Guy Martin and hid dad have used for years 

https://www.georgelodgedirect.co.uk/Products/o-rings-2mm---20mm-inside-diameter/12.5%20X%202%20PACKET%20OF%206

I understand that you are only doing 'O' rings for 500/550 but someone needs to come up with a suitable  replacement for 12115-300-305
(See Service Bulletin no. 42) attached. These allow the later head gasket intended for later cylinder heads with the knock pins  to be used on early heads.

As I understand it, a nitrile 12.5mm ID x 2.0 O ring is a decent alternative. A quad ring 'x' section, might be even better but might take a bit of sourcing.

[ Guests cannot view attachments ]

US cleaners are switching several hundreds of volts at very high frequency into a highly
 capacitive load and are notorious for going pop...even the Ultrawave pro units do it. The usual failure items are power transistors or MOSfets that drive the US transducers. They are the 3 legged devices on heatsinks. Best bet is to use a multimeter on  diode test function to check every diode and betweel all legs of 3 legged output devices on heatsinks. The usual failure mode is short circuit, which will show 0v on the  diode test. If you experience this then best to desolder the device and re-check out of circuit just in case another component such as a coil etc is affecting the reading.

I have this one pictured below spare .. decent conditions and the  springs feel OK too. Don't really want to split it up. [ Guests cannot view attachments ] [ Guests cannot view attachments ]

If you want it it's yours ...Just PM your address if interested.   I really value all of the advice you give on here