John has put together a list of the gaskets from Ortmann. For those not familiar with Ortmann gaskets, using John's excellent reference, plus help from Ronny, Norm, Jules, Matthias, Chas and Don to identify some of the unknowns, you should be able to find the gaskets you need, and to match the gaskets to the original parts numbers.
| A 12392-548-000 Under Cover Gasket | B 18242-504-010 Exhaust manifold Gasket |
| C 18150-506-000 Exhaust Manifold Copper rings | D 30211-500-004 Distributor O Ring 63.5 x 3.0 |
| E 12193-500-060 Chain Case Gasket | F 12251-506-010 Cylinder Head Gasket |
| G 91308-506-010 Cylinder sleeve bottom seals | H 30139-500-010 Distibutor Body Gasket |
| I 91318-500-000 oil pump housing O ring | J 91317-500-000 Oil Return Pipe ends O ring |
| K 91309-500-010 Water Channel Intake Manifold to head | L 91302-504-010 Head gasket side O ring 22 x 3.0 |
| M 15329-500-020 Oil Pumpr Cover Gasket | N 15319-500-020 Oil Pump Body Gasket |
| O 17111-506-000 Intake manifold gasket | P 11791-500-010 Oil Pan gasket |
| Q 19901-500-050 Water Pump gasket | R 19331-500-010 Thermostat to housing Seal |
| S 19903-500-040 water pump casing gasket | T 19319-500-343 Thermostat Body Gasket |
| U 14591-500-030 Tensioner base gasket | V 91315-500-000 Oil Filter Shaft O ring |
| W 91313-500-000 Tensioner push bar O ring | X 91312-500-000 Chain Guide O ring |
| Y 91205-500-000 Front cover oil seal | Z 11591-500-040 Front cover gasket |
| AA 91317-500-000 Check Valve O Ring | AB 91302-500-000 Oil Dip stick holder O ring (91301-428-003) |
| AC 91208-500-020 Rear Main oil seal | AD 12191-500-100 Cylinder sleeve Gasket |
| AE 91306-500-010 Cylinder Sleeve O Ring x2 | AF 11691-500-030 Rear Cover Gasket |
| AG 91305-500-010 Cylinder head to Camshaft 6 X 3.8 | AH 91201-506-000 Tachometer gear shaft seal |
| AI 12449-506-000 Tachometer gear holder | AJ 91207-500-020 crankshaft Seal 16 - 26 - 4 |
| AK 90471-500-000 Oil Check Packing (Cylinder) | AL 90476-500-000 Oil Pan Drain Plug washer (9410914000)? |
| AM 90472-500-000 Intake Manifold drain plug gasket | AN 91306-500-000 Water passage between block and cylinder head? |
| AO 91305-516-000 Crankshaft main bearing oil passage 6 x 3.8 | AP Choke Plate A and Chocke Plate B (Eurasia or Ortmann) |
| AQ oil screen (Picture courtesy of Spread-tool) | AR contact beaker (Eurasia or Ortmann) |
| AS 42567 (25358) Sproket Oil Seal | AT 27 x 3.0 O-ring may be 91318-500-000 oil pump 27 x 2.7 |
|
AU 9 x 2.0 O-ring is used for the crankcase to block joint original 9 x 1.8. |
AV 16-32-5 oil seal is 30111-500-004 distributor oil seal, inside distributor body, rarely replaced |
|
AW 91307-516-000 late S800 (MK II) starting clutch 20.5 x 1.5 |
AU Crankshaft Nut and Washer (Eurasia-ps) |
Thanks Ronny for the following information:
| Number | Numnber | Part Number | Picture above | |
| Honda S600 Gasket Set | Required for Repair | |||
| Gaskets |
Engine Overhaul |
Head Rebuild |
||
| Gasket Undercover | 1x | n.a. | 12392-548-000 | A |
| Gasket Cylinder Head | 1 x | 1 x | 12251-506-010 | F |
| Gasket Chain Case | 1 x | n.a. | 12193-500-080 | E |
| Gasket cylinder sleeve | 1 x | n.a. | 12191-500-100 | AD |
| Gasket Oil Pan | 1 x | option | 11791-500-020 | P |
| Gasket intake manifold | 1 x | 1 x | 17111-506-000 | O |
| Gasket tensioner holder | 1 x | option | 14591-500-030 | U |
| Gasket Exhaust manifold | 1 x | 1 x | 18242-504-000/010 | B |
| Gasket for Thermostat housing | 1 x | 1 x | 19319-500-343 | T |
| Gasket Water pump casing | 1 x | 1 x | 19903-500-040 | S |
| Gasket Water pump | 1 x | n.a. | 19901-500-050 | Q |
| Gasket crankcase front cover | 1 x | n.a. | 11591-500-060/070 | Z |
| Gasket crankcase rear cover | 1 x | n.a. | 11691-500-030 | AF |
| Packing Distibuter body | 1 x | 1 x | 30139-500-010 | H |
| Gasket oil pump body | 1 x | n.a. | 15319-500-020 | N |
| Gasket oil pump cover 2 styles included | 1 x | n.a. | 15239-500-020 | M |
| Gasket tachometer gear holder | 2 x | 2 x | 12449-506-000 | AI |
| Packing contact breaker | 1 x | 1 x | 16781-506-000 | AR |
| O Rings | ||||
| Water channel large cylinder head & intake 20 x 3,8 | 1 x | 1 x | 91309-500-010 | K |
| Oil passage upper crankcase 8 x 1,6 | 3 x | 3 x | 91306-500-010 | AE |
| Water passage between block and cylinder head 6 x 1,5 | 1 x | 1 x | 31306-500-010 | AN |
| Liners bottom seal 58,5 x 2 | 4 x | n.a. | 91308-506-010 | G |
| Oil passage cylinder head to camshaft bearings 6 x 3,8 | 6 x | 6 x | 91305-500-010 | AG |
| Oil passage crankshaft bearings 6 x 3,8 | 3 x | n.a. | 91305-516-000 | AO |
| oil passage between engine block and crankcase 18 x 3,6 | 1 x | n.a. | 91317-500-000 | J |
| oil pump tube between cylinder head cnd crankcase 18 x 3,6 | 2 x | 2 x | 91317-500-000 | J |
| oil pressure releif valve 18 x 3,6 | 1 x | n.a. | 91317-500-000 | J |
| thermostat housing | 1 x | 1 x | 19331-500-010 | R |
| Oil dipstick holder 36 x 3 | 1 x | n.a. | 91302-500-000 | AB |
| Head gasket O ring to engine 1002291 22 x 3 then 91311 | 2 x | 2 x | 91302-504-000 | L |
| idler distribution 15 x 1,8 | 1 x | n.a. | 91312-500-000 | X |
| centifugal filter shaft 11 x 1,8 | 1 x | n.a. | 91315-500-000 | V |
| oil pump housing 27 x 2,7 | 1 x | n.a. | 91318-500-000 | I |
| lid side cylinder water passage 25 x 2,5 | 1 x | 1 x | 91301-531-000 | block heater |
| between intake manifold and carbeurator rubbers 29 x 3 | 4 x | 4 x | 16229-516-010 | |
| distributer cap ring 63,5 x 1.8?/3.0 | 1 x | n.a. | 30211-500-004 | D |
| between starter and starter gear | 1 x | n.a. | 31324-500-005 | |
| starter motor to underblock 79,4 x 3,1 | 1 x | n.a. | ||
| Seals | ||||
| transmission (gearbox) mounting plate seal 58(56) x 76 10 | 1 x | n.a. | 91201-512-000 | AC |
| Rear crankshaft seal 16 x 26 x 4 | 1 x | n.a. | 91207-500-020 | AJ |
| Starter clutch lid (dry) 42 x 56 x 7 | 1 x | n.a. | 91205-500-000 | Y |
| Starter clutch gear seal (dry) 25 x 35 x 8 | 1 x | n.a. | 91206-500-010 | |
| Starter gear seal 15 x 29 x 9 | 1 x | n.a. | 91211-500-000 | |
| tachometer seal | 1 x | 1 x | 91201-506-000 | AH |
| Miscellaneous | ||||
| Oil Pump Inlet strainer (screen) | 1 x | optional | 15420-506-000 | AQ |
| Exhaust Manifold copper gasket rings | 4 x | 4 x | 18150-516-000 | C |
| Crankshaft washer 16 mm lock washer | 1 x | n.a. | 90434-500-020 | AU |
| Crankshaft nut 16 mm locknut | 1 x | n.a. | 90231-500-010 | AU |
| Oil Check plug gasker (in cylinder) | 1 x | 1 x | 90471-500-010 | AK |
| Water choke plate B | 1 x | optional | 12262-516-000 | AP |
| Water choke plat A | 1 x | optional | 12261-516-000 | AP |
| Chain tensioner | 1 x | n.a. | 14500-531-000 | |
| chain guide roller | 1 x | n.a. | 14630-500-030 | |
| Guide roller head | 1 x | optional | 14620-516-000 | |
| guide roller chain case | 1 x | n.a. | 14610-516-010 | |
| Oil pan plug gasket | 1 x | 1 x | 90476-500-000 | AL |
| temperature sender gasket | 1 x | 1 x | 90472-531-000 | |
Norm added the following insight:
The O-ring used for camshaft bearing holders and S600 crankshaft bearing holders, 91305-500-010, 6 x 3.8, shown for the crankshaft but not the camshafts in my S600 parts manual, also is shown in the S800 manual for S800 camshafts, but with size 6 x 3.4. I believe the 6 x 3.8 is correct, but in any case the US standard size -202, exact dimensions 5.94 x 3.53, makes a fine substitute. Good substitutes for most of the O-rings can be found in readily available US standard sizes if you are short.
Large water channel cylinder head to block, early S600 engine to 1002291, 91302-504-010 O-ring 22 x 3.0, S600 engine from 1002292 and S800 all, 91311-500-010 O-ring 26.5 x 3. Be careful not to confuse with slightly larger 27mm oil pump O-ring. 91301-531-000 O-ring 28 x 2.5 is for the optional block heater. S800 crank bearing holder O-ring 91306-516-000 O-ring 8 x 3; other S800 O-rings are the same as the S600 parts.
Good Luck
Eric