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Doms CB550F1 project
Laverda Dave:
--- Quote from: DomP on May 21, 2025, 04:50:10 PM ---Yeah its definitely getting there, just splashing the cash on heating the workshop up🤣
Do these carb adjusters look at bit far out? Most photos I see they only show a few threads. I think I'm going to get them off and revisit the whole carb thing while the tanks hardening up.
--- End quote ---
I had a similar issue with the 400/4 carbs Dom. I couldn't understand why so took the carbs off to check. Turned out I had the choke fast idle screw set out too far (the screw that is part of a hex head adjuster and is offset to the hex so as you turn the screw to adjust it it moves concentrically against the carb fast idle lever which is a ramp basically and it in turn raises the carb slides to increase the revs). This only operates when you have the choke on BUT if it is set incorrectly with no clearance when the choke is off the slides will not close properly and you end up winding out those carb adjusting screws as per your photo in an attempt to drop the revs but you won't succeed because the cold start lever has no clearance!
That's how it works on the 400/4 Carbs anyway, it may be completely different on the 550!
Laverdaroo:
I’d forgotten about that Dave, that’s what the issue was when I originally started the 400, completely forgotten about doing exactly the same thing. It suddenly clicked and I did as you just described. I wonder how many people have had just that issue.
It’s 18 months or so since the 550 was started due to fear of glazing the bores and worked on the mudguards, tank etc. I couldn’t run it as I didn’t have a seat anyway until early this year so until I could, starting wasn’t a priority.
Again, can’t remember what I did to get it running nicely, too much crap has occurred since then and my ‘head’s a shed) at the min. The dusty filing cabinet of a memory can’t dig that one out at the min..
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DomP:
I think I follow that Dave. To be honest, getting that part where the throttle comes to a stop on the off set hex you are referring to has been a bit troublesome. There are some measurements in the Honda manual that are so sketchy I still can't work out where they are measuring from.
DomP:
Definitely 2nd from top not bottom for 069a carbs? Cb550f
Oddjob:
Yep, 2nd down, on needles marked 273004.
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