Author Topic: CB400/4 Carb Float Pins  (Read 308 times)

Offline Laverda Dave

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CB400/4 Carb Float Pins
« on: January 11, 2024, 09:08:12 PM »
Does anyone know the diameter of the float pins used in the carbs and a supplier of new ones? I have mangled two of mine getting them out of the float hinge, they were stuck fast and nothing would get them out. In the end and after soaking them in clock cleaning fluid, the ultrasonic bath and carb cleaning spray I had to use a blowlamp very, very carefully to expand the hinge enough to pull the pins out but in so doing they were bent, twisted and scored by the
pliers!
From what I can see it is a length of brass rod and doesn't appear to have a taper.
This is the worst set of carbs I have ever seen, they have been soaked in carb cleaner and been in the ultrasonic bath four times for 30 minutes each time and only now are they looking clean. I soaked the jets etc in clock cleaner for 2 hours before plunging into the ultrasonic bath. Carb bodies No 1 & No.4 are replacements as the support pins were broken.
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

Offline Nurse Julie

  • 1977 CB550/4 Mongrel Brat. 1974 UK 500/4 K1. Honda CD250u.
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Re: CB400/4 Carb Float Pins
« Reply #1 on: January 11, 2024, 09:26:53 PM »
The float pins are 1.96mm x 22.96mm Dave. I stock them in a different size for the 500/550 and 750 but have never bothered making them for the 350 or 400. The ones on Hettie were tapered but I don't know if they were original or not.
« Last Edit: January 11, 2024, 09:54:23 PM by Nurse Julie »
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Offline Nurse Julie

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Re: CB400/4 Carb Float Pins
« Reply #2 on: January 11, 2024, 09:55:10 PM »
Dave, I've just amended that figure, I typed 1.69mm, it's 1.96mm 😊😊😊😊
LINK TO MY EBAY PAGE. As many of you know already, I give 10% 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 Laverda Dave

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Re: CB400/4 Carb Float Pins
« Reply #3 on: January 12, 2024, 01:22:24 PM »
Thanks for the dimensions Julie.
I have just ordered a 100mm length of 2mm brass bar from a model shop for £2 so I’ll make my own. 1.96mm is very close to 2mm so they may fit straight off or else I’ll put the bar in the old Myford and use a bit of emery cloth to polish it down to size.
1976 Honda 400/4
1977 Rickman Honda CR750
1999 Honda VFR 800FX
1955 750 Dresda Triton
1978 Moto Morini 350 Sport
1978 Honda CB400/4 'Rat' bike
1982 Laverda 120 Jota

 

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