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New (to me!) '77 CB400F - US model
mattsz:
I've spent a good long while reading through carb cleaning posts - not finding anything definite: I'm hoping to clean all the carb bits I've removed from inside the float bowls - I haven't split the carb rack or opened the top covers. What's the best way to do this? Any particular solvents better than others? I have carb cleaner spray, and some cans of solvents, including mineral spirits (paint thinner), lacquer thinner, acetone, kerosene (paraffin for you blokes?), even alcohol. I could buy a gallon-can of liquid carb dip, but it's not cheap.
I wasn't planning on any kind of major soak for the four attached carb bodies, but I'll need to clean the undersides of the carbs and all the passages (spray for that, I guess)...
taysidedragon:
Carb cleaner spray and use of an old toothbrush cleans up the carb bodies ok.
To clean all the passages and jets it's best to use an ultrasonic cleaner. Check passages are clear afterwards with air jet can (computer type) or carb cleaner spray. No prodding with wire!
mattsz:
--- Quote from: taysidedragon on April 14, 2020, 10:54:10 AM ---Carb cleaner spray and use of an old toothbrush cleans up the carb bodies ok.
To clean all the passages and jets it's best to use an ultrasonic cleaner. Check passages are clear afterwards with air jet can (computer type) or carb cleaner spray. No prodding with wire!
--- End quote ---
Thanks! Not even thin copper wire? This seems a fairly common procedure.
mattsz:
--- Quote from: mattsz on April 13, 2020, 11:30:12 PM ---While we're playing with 400 carbs, I have another choke operation question.
There's a cam-driven linkage which appears to tie the choke to the throttle...
--- End quote ---
Never mind... I found this on page 7 of the factory manual:
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Clearly mine is not correctly adjusted.
Even with my carbs sitting on the bench, I'm not sure I can reach that adjustment with any tools I currently have. I certainly can't imagine being able to do it with everything assembled on the bike... must be possible, though...
Laverda Dave:
Looking at your re-adjusted carbs with the chokes open is about right. As Taysidedragon mentions, they are normally open 95% of the time so that is where you want the adjustment to count. As an aside, when I start my bike on full choke I have to open the choke a fair amount once the engine has started otherwise it races up to 3000RPM.
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