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Doms CB550F1 project
McCabe-Thiele (Ted):
It's under Misc/open on here Dom although the video shows single cylinder bike his explanation seems logical - up to now no one has commented on the post.
DomP:
--- Quote from: McCabe-Thiele (Ted) on July 12, 2024, 10:19:37 PM ---It's under Misc/open on here Dom although the video shows single cylinder bike his explanation seems logical - up to now no one has commented on the post.
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Oh I've watched that before, maybe I'm barking up the wrong tree then but the rich smell of fuel led me to think it needed leaning out not richening. I'd say I have a climbing idle not a hanging idle though so I'll check for an air leak tomorrow
McCabe-Thiele (Ted):
When altering the mixture on SU carbs on cars my late father told me the best guide to lean or rich was the exhaust temperature a rich mixture gives a cold exhaust out of the pipe , a lean mixture gaves a hot exhaust - he never mentioned petrol smell.
Laverdaroo:
--- Quote from: DomP on July 12, 2024, 06:34:02 PM ---
--- Quote from: Laverdaroo on July 12, 2024, 06:17:15 PM ---Nah, 143mph sounds about right Dom. I take it you didn’t get it in ‘top’ then?
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No not this time Roo, this was just through town on the back wheel.
I'm considering taking the carbs off do double check the float heights, jets are all clear and that I've set the bench sync to bottom out with the idle screw out, somethings not right to be running rich 2 1/4 turns out and have a idle that keeps rising with the throttle shut.
What do you think regarding the throttle linkage Roo?
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Just got home tonight axon, I’ll have a look tommoz, found a bottle of Landlord in the fridge and well that was that!
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McCabe-Thiele (Ted):
--- Quote from: DomP on July 12, 2024, 08:37:25 PM ---
--- Quote from: McCabe-Thiele (Ted) on July 12, 2024, 08:03:45 PM ---On the 550 with the solid brass screw I thought the settings are 1/4 turn out as a base point. If you are over two turns out my understanding is that you have let so much air in it will be running far too lean pulling fuel from the main jet when it can. Opening the screw slows down the amount of fuel from the idler jet so it's trying to draw fuel from the main jet instead. Look at that video I posted about hanging throttles.
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I believe on mine which are 069a's (550F1) the base setting is 1 3/4 turns out, if I richer it it stinks of fuel and soots up the plugs. I'm happy to be wrong if it solves the hanging idle however 😄
Where the video Ted, worth a watch I think
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It might be I'm confused about the screw turns - it might be 1/4 turn for a 500 fitted with the 550 carbs.
I guess it's this table that you are refering to.
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