SOHC.co.uk Forums > CB350/400

Progress - She runs at last! (75 CB400F)

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ManicGTI:

--- Quote from: K2-K6 on November 08, 2016, 10:34:06 PM ---It's exactly what a float chamber is for,  to break the head pressure ( no sniggering at the back there,  oddjob and Julie) and provide a reasonably constant fuel weight for the carb's vacuum to work on, which in turn gives you a chance of linear jetting response.

If it didn't do this then as the fuel tank volume varied then so would the jetting and the float height would be absolutely meaningless.

--- End quote ---

Thanks for the clarification, I have to admit I'm new to Carbs and this era of vehicles.  I'm used to working on Mk1 Golfs and MX5s!


--- Quote from: mike the bike on November 09, 2016, 07:35:54 AM ---Take a few photos, we may be able to spot the problem.

--- End quote ---

Thanks, I'll try and take some clearer images of the set up as it stands as soon as I can.

ManicGTI:
Stealing a pic from ebay for reference, i'm confident that I assembled the adjusters correctly (although I could be proven wrong!):


So if I back all the adjusters out, the throttle will be returned towards the idle adjustment screw, and the slides towards closed?  I'll give it a poke tonight.

mike the bike:
Now you're thinking it through logically.   Dont try starting the bike with Hophouse 13 (other beers are available)

petermigreen:
There is another factor here.

I had the same issue when I stripped/rebuilt my carbs. Following all the set up dimensions in the Haynes manual, I could not get my Idle screw to operate in the normal range. After a lot of checking and re-checking I finally worked out that I had re-assembled the throttle assembly incorrectly.
Have you done anything to the spindle that the throttles pivot on? Mine was slightly out of position and affected the whole operation of the throttle. There is a flat on the top of the spindle that a fixing bolt locates on and it's fairly critical where it's positioned in my experience. Once I worked this out, I had my carbs dialled in sweet.

Where about in London are you?

Peter.

ManicGTI:
This was pissing me off so I made haste home on the Street and got cracking. Backing all the adjusters off did bring the throttle Mech back round to about 2mm from the idle screw. Much better! I've now synced them with a 1.5mm drill bit.

Thanks for that tip Peter,  I'll take a look at the Mech position.

I was up near Dalston on the same road as Tom, but now in New Malden.

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