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Doms CB550F1 project
DomP:
I took my first real ride out lastnight just to see if any of the running issues might sort themselves out. It seems to accelerate fairly well after bogging down a bit, the idle is the main problem though, it raises between gear changes and when coming to a standstill at junctions to the point I had to flick the kill switch on and off to settle it. Other than that the front brakes are a bit woeful and I have a bobbly front end, could be a lack of wheel balancing or the oil weight maybe?
*oh and I hit 143mph, think I need to calibrate my speedo🤣
Laverdaroo:
Nah, 143mph sounds about right Dom. I take it you didn’t get it in ‘top’ then?
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DomP:
--- 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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--- End quote ---
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?
McCabe-Thiele (Ted):
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.
The 500 has a different design of air screw so needs more turns to achieve the same effect.
DomP:
--- 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.
--- End quote ---
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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