O-Ring sale CB500/550

[Oddjob]

As promised in my measuring oring thread I have managed to start supplying orings for certain parts of the CB500K and CB550F/K. Please check with me first if your not sure if the rings will fit your particular bike.

The range is still fairly small but it will expand as time goes by. I need to buy in bulk in order to get prices as low as possible and the initial outlay is well over £1000. As the new rings start to arrive I'll expand the list.

If the rings come into contact with modern petrol they will be Viton™ rings, if they don't they'll be Nitrile.

Oil Pump kit, 5 rings included. The first batch though will have 6 rings. There will be 1 x Oil Pressure relief valve 91315-044-000,  2 x Dowel rings 91301-268-020, 1 x oil pump to crankcase 91302-250-010, 2 x Oil Pump cover rings (these are not listed by Honda) this is because it's this ring I'm still assessing, I have 2 members testing which is best. However I'll provide both and you can decide which you prefer until I get some feedback either way on which works the best. All the orings are the exact size required. I've taken pics of genuine rings fitted out of a full gasket kit and my rings and they are identical. I can safely say this is the best kit out there. Cost £7 inc P&P. DS want £15.83 plus P&P for the 4 rings that are available.

I also can do the 4 oil gallery orings, these are the 3 plugs which fit in the lower crankcase and the one which is fitted to the plug in the main oil gallery inside the generator cover. So 3 x 91315-044-000 and 1 x 91319-300-000. Cost £5 inc P&P. DS wants £16.06 plus P&P for these 4 rings.

I also have available.

Camshaft end cover cap rings, 91319-323-000. These are in Viton™. 40p each plus P&P or free postage if ordered with any set

Dipstick oring 91354-702-000 30p each plus P&P or free postage if ordered with any set

Starter motor end cap, 91309-300-000 40p each plus P&P or free postage if ordered with any set

Starter Motor internal oring, 91206-286-158 40p each plus P&P or free postage if ordered with any set

CB550F/K clutch adjuster bolt, fitted low down on the clutch casing. 91301-040-000 40p each plus P&P or free postage if ordered with any set.

Tacho Drive and oil restrictor orings at base of barrel 91309-035-000 40p each plus P&P or free postage if ordered with any set

Coming soon will be tappet cover rings and inlet manifold rings, 91302-001-020, the EXACT size as specified by Honda. These have to be specially made to order.

Also a full carb set of orings in Viton™. Again specially made to order and the exact size needed. I've already tested the float bowl ring and this one stays inside the groove without needing glue, unlike any others I've fitted in the past.

[McCabe-Thiele (Ted)]

That's a very timely post Ken - I have some concerns about my oil pump O ring set in particular the one behind the plate held on with three JIS screws - I will PM you.

[Toko_Jo]

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.

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[Trigger]

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.

(Attachment Link)

I have many suitable replacements but, it all depends on what head gasket you will use as different manufactures used different thickness 

[Toko_Jo]

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.

(Attachment Link)

I have many suitable replacements but, it all depends on what head gasket you will use as different manufactures used different thickness 

Genuine Top end set .. marked K3 on the outer packing ( has the adhesive stuff in the centre section).

[Oddjob]

Closest I can find in Xring is 12.42 x 1.78

[Toko_Jo]

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

[Trigger]

I always upgrade to Viton on the hundreds of SOHC engines i have built over the years 

[Toko_Jo]

I always upgrade to Viton on the hundreds of SOHC engines i have built over the years 

So what thickness Viton™ 'O' /  quad -ring would you recommend for use with genuine / late model head gasket please?

[Oddjob]

I can get them a lot cheaper than that link Jo. I doubt I'll start to sell them though as I'm not really interested in doing 750 stuff, it's not my area, I don't have an engine etc to test them on so I'd prefer to concentrate on stuff I know and what I can ensure the fit is perfect.

[Oddjob]

Added to list above, 91309-035-000.

Tacho drive oring also the same as the oil restrictor oring at the base of the barrels.