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Doms CB550F1 project
davidcumbria:
I found the pilot airscrews have a much bigger effect than you’d think so try experimenting with them 1/2 turn further in or out and see what changes. Are all the cylinders running at similar temperatures - an infra red temp gun is cheap and useful.
McCabe-Thiele (Ted):
What sort of gap did you have when you bench synchronised the carbs?
I went for zero on the 500 so even on 3 and a bit cylinders no issues with setting the idle.
On my 400 I used an odd sized drill shaft it was something like 3/32.
Reads as very difficult with no working rev counter.
DomP:
I missed these replies sorry folks.
An infrared temperature gun is something I keep meaning to get so I think I'll order one now David. I've set my pilots to the standard 1 1/2 turns out but have not tried at 1 3/4. As for gap Ted, I set it very much at the smaller end but forget what it was now, the rev counter issue is really not getting closer to solved, I need to email Koso to try and get to the bottom of it I think, I've made a rod for my own back by not using the same brand gauge as the speed sensor too.
McCabe-Thiele (Ted):
--- Quote from: DomP on June 09, 2024, 03:13:09 PM ---I missed these replies sorry folks.
An infrared temperature gun is something I keep meaning to get so I think I'll order one now David. I've set my pilots to the standard 1 1/2 turns out but have not tried at 1 3/4. As for gap Ted, I set it very much at the smaller end but forget what it was now, the rev counter issue is really not getting closer to solved, I need to email Koso to try and get to the bottom of it I think, I've made a rod for my own back by not using the same brand gauge as the speed sensor too.
--- End quote ---
Those tables show a wide range of 1-2 turns for the 550F,F1 & F2 069A type carbs Dom, are you definitely air leak free in all three areas between carbs and cylinder head?
I use a bit of alloy pipe as a listening tube to check for air leaks - it amplifies any sounds of air being sucked in - plastic pipe works but not as much amplification.
Laverdaroo:
1 1/34 is base setting Dom, +/- 1/2 turn but it’ll be more I should think. Set em all at standard then work from there mate.
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