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Progress - She runs at last! (75 CB400F)

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Laverda Dave:
Bryan, The float valves are from the Keyster (?) kits I bought and do not have a viton sealing rubber on the tips as the old ones did. I'll give it another go maybe over the weekend when I get the helicoil kits (thanks for the tip Chris, the kit is on order). I will test the floats to see if any are punctured.
Its only the carbs that are stopping progress and the MOT  :(

petermigreen:

--- Quote from: ManicGTI on November 08, 2016, 12:01:47 PM ---Thought i'd drop this simple little Carb Float explanation here for prosperity, although it's light on actual technical explanation: https://www.fix.com/blog/motorcycle-carburetor-float-height-adjustment/.

I've had another thought regarding my richness.  At the moment I have the Fuel tank sat off to one side on top of my garage shelf's, (ie >1m higher than the bike itself), running a temp long fuel hose down to the carbs so I can work on it with the tank off.  Would the additional head from this setup cause me issues?

All being well I should get a chance to pull the carbs and reBench Sync / Float Check tonight :P

--- End quote ---
I read in classic motorcycle mechanics magazine recently that you should not mount your tank/fuel source to high for this very reason.

tom400f:
I've got an old two stroke oil tank you can use of you want Dave. You can make a list of the stuff off mine you have  ;)

ManicGTI:

--- Quote from: Bryanj on November 01, 2016, 08:10:55 AM ---With a bench sync it is easy to get the slides so they dont close

first back off the idle screw till it falls out, then un adjust the carb slide adjusters so all slides hit the bottom pick one(on the 550 k3 its easy as one has no adjuster) and adjust the slide adjuster till it nearly moves, refit the idle screw and adjust it till the one you picked lets your prefered drill bit fit, 3mm is too big you need 1.5 if poss, then adjust all the others to the same. Finally undo the idle screw again and make sure all slides hit the bottom.

Run engine till hot ad ajust with gaudes AFTER you haveset tappets, cam chain and ignition timing

--- End quote ---

Ok, I just tried it this method and hit on an isssue straight away.  Essentially the idle screw bottoms out just at it touches the casting, so i'm getting nothing out of the idle screw.  Hmm, an adjustment i've missed?

K2-K6:
I think the motorcycle mechanics need to sit down with a nice cup of tea and a biscuit to give themselves time to think about that.

 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.

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