SOHC.co.uk Forums > CB350/400

400 four main jet o ring

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McCabe-Thiele (Ted):
That's weird, the part number on Google must be wrong.
 My excuse is I had a bout of insomnia hence the post time.

ST1100:

--- Quote from: McCabe-Thiele (Ted) on November 30, 2025, 10:42:53 PM ---According to Google serach
<>
Part Number:OEM part number 91301-426-010.

--- End quote ---
Never trusted Google... comes back as 'O-ring oil-bore cylinder head'...
https://www.cmsnl.com/products/o-ring-49x25_91301426010/

this seems to be it 16177-551-004
https://www.cmsnl.com/honda-cb350-japan_model50676/42x11-o-ring_16177551004/

ozzybud:

--- Quote from: McCabe-Thiele (Ted) on November 30, 2025, 10:42:53 PM ---According to Google serach

The main jet O-ring for the Honda CB400/4 is a 4.2mm x 1.1mm O-ring. This is the correct size for the secondary main jets in the Keihin carburetors used on this model, and it is also the size for many other Honda motorcycles from that era, such as the CB350, CB500, and CB550.

Dimensions: \(4.2mm\) (inner diameter) x \(1.1mm\) (cross-section).

Part Number:OEM part number 91301-426-010.

--- End quote ---

Please don't trust google for anything these days especially for motorcycle or medical advice.
The o-rings i posted above are the correct material and fit. They pop in snugly.
All of the kits you can get in the states do not have the correct main jet o-ring.
I have been using these for years and sharing with friends. If you were close I would gladly send you a set fir free.

McCabe-Thiele (Ted):
 

 I blame AI as well.   8) 8) 8)

Oddjob:
Is that the correct material Ozzybud?

Says NBR on the packaging and if memory serves that’s nitrile, which is not recommended for today’s fuels containing ethanol. Surely Viton or FKM would be a much better choice?

AFAICR the original orings were nitrile and so I’d avoid replacing with genuine parts for this application as the same problem will just reoccur. Unless Honda have changed the material at a later date to allow for this.

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