SOHC.co.uk Forums > CB350/400

Fitting round float bowl o rings

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exvalvesetdabbler:
I was wondering if anyone has some good tips for fitting round float bowl o rings.  I kind of remember that they used to be shaped to fit.  The last remaining OEM kit that I bought, probably 15 years ago has a round one as do the current offerings.

If you glue them down at the corners, the ultimate seal is only as good as the glue is to resisting fuel.

Also thinking if a length of o ring chord might be just as easy/difficult.

Regards
Dave

Nurse Julie:
The lightest smear of red rubber grease gives enough stiction to hold them in place or a small dab if super glue at each bend also works.

Oddjob:
I doubt cord would work as they’d be a gap where the 2 ends meet. It may just leak a little as a result.

As for the round orings supplied these days, if it’s a genuine kit from Honda you’ll find that it fits with no glue. There are pinch points around the float bowls where it grips the ring, the problem is when you buy kits not made by Honda. Most haven’t got them right as regards the thickness, then the pinch points struggle as there just isn’t enough for them to grip securely. So you need glue or grease to bond them to the bowl until you can fit the screws. I’d imagine they’ll be fine afterwards as they’ll adapt to the shape over time. I did have the size of the float bowls where rings at one time, they fitted with no glue required. That was for the 500/550 bowls but they may be the same as the 400. The thickness should be either way. I’ll see if I can find it.

exvalvesetdabbler:
I have one genuine honda o ring from a kit so I'll just measure that.  Getting it laid out on the table  in a perfect circle to measure it is the challenge. Can't decide if it's 63,4 or 5 ID.  Others have reported using 63x2. The OEM one I have here is more like 1.8 cs.  Haven't noticed any pinch points when cleaning years of gasket goo out with acetone.

Regards
Dave

Oddjob:
Just found it. The 500/550 uses a 67x 1.9 oring. However that’s not readily available so I used a 67 x 2.0mm and that fitted with no glue etc required. You could always try that size and see if it fits ok.

There is a formula for working out the id of an oring, you cut it, measure it’s total length then divide by a set amount and that gives you the id you need. It’s around on the web somewhere.

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