SOHC.co.uk Forums > CB350/400

Main jet O rings

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paul G:
Hi all,
               Anyone know the size of the O ring on the main jet for the 400/4

Cheers,

andut:
Paul,

I found a measurement of 3.5mm ID and 1.2mm X section from an online search, butg have never checked it !

Andy

Bryanj:
original part no 16177-551-004  4.2x1.1mm

andut:
Part number description #@%$'s a year old random Google search !

paul G:
Found this on the SOHC/4 owners club.

CARB O-RING SIZES: CB350, CB400, CB500, CB550

When rebuilding carbs on the old Honda fours with press-in main jets, you will often find that all the metal parts are fine after a good cleaning, and all that you really need to buy are new O-rings. Honda doesn’t sell the individual O-rings separately….

instead you have to buy a complete carb kit at $10 to $15 per carb. I found an industrial O-ring supplier who was willing to do small-volume counter sales, and was able to get new O-rings at about 50 cents per carb. Sizes are:

Main Jet: 1.2mm cross-section x 3.5 mm ID

Float Seat: 1.5 mm cross-section x 5 mm ID

Float Bowl Drain Screw: AS568-009 (7/32″ ID x 11/32″ OD)

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