Honda-SOHC

Ah did not realise you had new seats but used the old needles - I've read on this site about lapping them to suit - sounds promising.
Six cycles of removal wow I had enough with just 2 or 3 but I had the 400 airbox to struggle with.

Yup, sorry I didn't say about replacing the seats.  The cheap rebuild kit was a false economy and accounted for some of the removals, my own lack of inexperience made up the numbers.

If I had an air box to fight with I'd be a lot closer to desperation but as it is I'm staying zen and thinking hard about what I'm doing and what the carb is doing.

I saw some posts about Redex being a quick fix, not sure how that works but have been anointing/cleaning components with it just in case, along with polishing the brass pivot pins.

One man's sticking float is another's poorly seated valve.

And thank you Ted, carbs are off (not a big job on the 6th time)

I had cleaned them up in the ultrasonic and replaced the float valve seats but not the needles as the, not-from-Keihin rebuild needles were nasty so I re-used the existing.

Figured that they might not have matched too well so have lapped one in, in situ, and rigged up a bicycle track pump to pressurise the fuel line to that bank.

With the carbs sitting on the intakes (almost horizontal but enough for the floats to push on the springs ) I can clearly see that the lapped valve is now sealing and the other one is not.

I'm hoping that I've accidentally found a way to check the 22mm float height at the point the valve actually closes without soaking myself in petrol.

I'll take a picture for a laugh, could be dumb, or dumber...

Thanks all for your hospitality.

A bit tardy to reply as pulling the carbs off again to address the pesky sticking floats.

Thinking of lapping the needle valves in with some autosol and a cunning use of tweezers.

She's got 627B carbs and I'd like to get them sorted before the temptation to buy CR26's gets too much.

Hark at me! Barely got here and already fishing for advice.

The money may have gone but the bikes from my past remain, mostly on the road with only a Guzzi T3 in pieces while I fit a new clutch.  I'll list them on my profile once I've fixed this petrol foot shower.

I too go the the Bike Shed in Shoreditch when I'm feeling flush, the food and vibe there is great.

Cheers...tim