SOHC.co.uk Forums > CB350/400
Progress - She runs at last! (75 CB400F)
Laverda Dave:
OK k2-K6 I'll give it a try although I can report I had the slides adjusted onto the drill bit like a feeler gauge, just felt a bit of resistance as I pulled the drill out. I will take the carbs off again and have another look, they were ultrasonically cleaned so I guess they would be clear of crud, never assume anything! I've bought a large can of carb cleaner and will give them a blasting with this before refitting and trying again.
I shall report back on progress.
K2-K6:
I'd say your bench setting was bang on then, I do think you've stepped back a bit from there though.
The Honda procedure for idle jet setting calls for you to change a single screw at a time and to observe the engine revs going up or down to determine how you eventually reach a good setup for each cylinder. I guess this is the real acid test for idle circuit impairments as if you fail to get a response from each one of them, then it would indicate a problem with that carb body.
I don't think Honda could envisage the ultimate problems we have in getting these carbs clean. In general use they are pretty good, but leave them not running with modern fuels and you'll soon run into certainly some minor problems if not completely blocked.
I know it feels very frustrating when they are not going right, but once you get sorted they are maintained with ease.
Generally to eventually think about carb balance gauges you'd need to be very sure everything else is set up well first. If you use them with any significant setup issues unresolved they'll just add to your problems.
Hope you are able to make a little more progress.
ManicGTI:
Hello again!
I'm sad to say that shortly after my last post above, the bike hasn't been touched - life caught up with me in the form of having a nipper and house refurb works. Hopefully @Laverda120 has had more luck than me!
Apologies to resurrect this thread, but I figured it shows the history of what i've been up to so far with this bike. This weekend I had a rare moment to have a play with it again, so I thought i'd look at some of the minor issues that I had never got resolved before, so I now have throttle and clutch cables hooked up, and all the lights are working again :o
I've fitted the hondaman Ignition unit and a new battery, it's now sat on the optimate so at least I know it'll have juice when I go out to play with it.
So, with 2 year old fuel (with some fuel keeper additive) and a bit of luck...it actually did fire up first time since my post above! Plugs 1 and 4 have sooted up immediately so assume these are rich, but 2 and 3 lare minty clean...bugger. Looks like I have spark on all plugs so I've pulled the tanks on all the carbs again, given all the jets etc a good blow through with carb cleaner. Hopefully that will help things after it's been standing.
I'm doing all this with the airbox out, tried to refit but my rubbers are knackered. Am going to try the 'wintergreen' method to soften them up as DavidSilver doesn't seem to have them in stock at the moment.
:)
Dave
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