Doms CB550F1 project

[Laverdaroo]

Don’t forget,
Wheelie’s passed the ‘all girl school’ bus stop are compulsory


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[DomP]

Don’t forget,
Wheelie’s passed the ‘all girl school’ bus stop are compulsory

That's more likely than a stoppie!🤣

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[Laverdaroo]

Don’t forget,
Wheelie’s passed the ‘all girl school’ bus stop are compulsory

That's more likely than a stoppie!

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Sent from my iPhone using Tapatalk

[DomP]

Did a sneaky first ride (proper countryside so no main roads)   

Some things no note and the reasons I ended it pretty quickly, I've got a hanging idle which revs up between gears, sometimes to high to be comfortable with.  Its definitely running rich which may be part of it?

Secondly when I got back and switched the key off it did a kind of intake of breath and popped a muted backfire, again this concerned me a bit so I'll wait some responses before I go out again.

Lastly, no speedo registering on my koso with daytona analogue to digital speed sensor as well as the well documented lack of rev counter

[Tony.B]

Did a sneaky first ride (proper countryside so no main roads)   

Some things no note and the reasons I ended it pretty quickly, I've got a hanging idle which revs up between gears, sometimes to high to be comfortable with.  Its definitely running rich which may be part of it?

Are you 100% sure carbs are balanced exactly? I remember back in my 400/4 days, that was always the giveaway that carbs needed balancing.

[DomP]

They're bench sync'd but not balanced as such, because it's a rebuilt engine I don't want to have it sat idling for long

[McCabe-Thiele (Ted)]

We have an old floor standing fan that I use when tinkering to give an air flow over the front of the bike.
It used to be whiteish - with the ravages of time  its now beige/yellow.

I've brought it down from my garage loft ready for setting the dynamic timing and the carb sych.

[DomP]

I have had this thought Ted, just I don't want the pistons and rings to suffer before they are bedded in

[Laverdaroo]

Im with Ted on that, get some fans on it but keep yoiur time idling to a minimum to reduce the risk of glazing. I dont have fans so going to be carrying my guages with me on the test rides. Roadside fiddling always been a part of my motorcycling career but  that might be due to the amount of old and shagged out Ducati's I've had.

[DomP]

The main problem I've caused myself is that I can't set the revs due to having no working rev counter.  I just can't get it to idle nice and even, when I blip the throttle the revs won't fall meaning I end up hitting the kill switch, it is pretty even across all four cylinders on my Morgan carb tuner though so that's a positive.

One other thing to note, sometimes when I turn the ignition on I get a pop/air type sound from around the battery or airbox.

[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)]

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.

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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