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Author Topic: Float Heights (again!)  (Read 217 times)

Offline XS850

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Float Heights (again!)
« on: November 25, 2025, 12:38:47 PM »
Hi All, can someone supply the relevant photos from Nurse Julie’s float height set up please, they’re not appearing when I go to the relevant tips & tricks post!

Also - has anyone ever measured the fuel quantity of a correctly set up float height? I’m getting 40ml on each carb - does that sound about right for CB400F float height setting?

Many thanks - Bruce
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Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: Float Heights (again!)
« Reply #1 on: November 25, 2025, 01:49:33 PM »
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Offline McCabe-Thiele (Ted)

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Re: Float Heights (again!)
« Reply #2 on: November 25, 2025, 03:29:18 PM »
I found these two links handy for setting the 21 mm float height, its quite a way down on the Vintage Bike builder, likewise it links you to the second site that wil show the 400 float type.


www.vintagebikebuilder.com/cb350-400f-carb-rebuild-demonstration.html

www.vintagebikebuilder.com/setting-mikuni-float-levels.html


I bought an inexpensive poor quality float gauge, I ened up using rubber bands to hold the setting in place. Mine was about £6 the one below looks a tad better

www.ebay.co.uk/itm/205068441561
« Last Edit: November 25, 2025, 03:38:07 PM by McCabe-Thiele (Ted) »
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Offline Athame57

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Re: Float Heights (again!)
« Reply #3 on: November 25, 2025, 03:42:54 PM »
I use a gauge like this to set float heights myself.  ;)
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Offline exvalvesetdabbler

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Re: Float Heights (again!)
« Reply #4 on: November 25, 2025, 03:50:02 PM »
Use. A Vernier caliper with depth gauge if nothing else.
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Offline McCabe-Thiele (Ted)

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Re: Float Heights (again!)
« Reply #5 on: November 25, 2025, 04:52:30 PM »
IIRC Ash made one out of an early PC floppy disc case!
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Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline Laverda Dave

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Re: Float Heights (again!)
« Reply #6 on: November 25, 2025, 10:21:59 PM »
You can make one from an old credit card (or even a new credit card to save unwanted spending on Christmas presents 🎁) 😉
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1977 Rickman Honda CR750
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1990 Honda VFR400R NC30

Offline XS850

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Re: Float Heights (again!)
« Reply #7 on: November 26, 2025, 08:57:51 AM »
Thanks Nurse Julie - exactly what I was lookin for that makes more sense to me with your description!

Also thanks to all other comments - I have a float height guage, it was just the description of what angle to have the carbs at for setting the “close” position!

Cheers - Bruce
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Offline Bryanj

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Re: Float Heights (again!)
« Reply #8 on: November 26, 2025, 02:48:40 PM »
One question looking at julies pics is are the floats the right way up?
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Offline Nurse Julie

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Re: Float Heights (again!)
« Reply #9 on: November 26, 2025, 04:33:24 PM »
Quote from: Bryanj on November 26, 2025, 02:48:40 PM
One question looking at julies pics is are the floats the right way up?

They were probably 500 or 550 carbs that I was fettling Bryan but I just took the photos as an example of how to set the floats.
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LINK TO MY EBAY PAGE. As many of you know already, I give discount and do post at cost to forum members if you PM me direct.
https://www.ebay.co.uk/sch/julies9731/m.html?item=165142672569&rt=nc&_trksid=p2047675.m3561.l2562

LINK TO MY CB400/4 ENGINE STRIP / ASSESSMENT AND REBUILD...NOW COMPLETE
http://www.sohc.co.uk/index.php/topic,14049.msg112691/topicseen.html#new

Offline Bryanj

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Re: Float Heights (again!)
« Reply #10 on: November 26, 2025, 05:58:38 PM »
Just a query as i just rebuilt a set for Paul Whitely and i think they came out other way up so you measured to flat side
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