Author Topic: Mixture screw direction  (Read 2465 times)

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  • Grogu
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Re: Mixture screw direction
« Reply #45 on: Today at 12:15:49 PM »
You've completely avoided the sentence written in that post

"Purely from an interest point of view, this shows working with exhaust gas analysis"

Do you seriously believe I've not noticed that the carbs differ in type and application.

Also it was in response to Dom who'd asked about this type of measurement. The post qualifies that, and explains better than written words what it entails with lucid view of that working method in yt content.

We can, on here, discuss method, details, specifications etc as part of a rounded conversation within topic.

Nobody is asking you to apply anything to your own singular situation. 

You refute the honda manual, usually make reference to your trade contacts, point out specific non success in setting up your own equipment,  your failure to make valid interpretation of technical approach clear, yet insist on disrupting thread without making valid overview.

What do you expet to get out of this process?

Offline McCabe-Thiele (Ted)

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Re: Mixture screw direction
« Reply #46 on: Today at 02:24:13 PM »
A ditty springs to mind...😀

I'm not a nitpicker, I'm a nitpickers son......etc

A tad out of context, but you get the drift.🤔
« Last Edit: Today at 02:25:44 PM by McCabe-Thiele (Ted) »
Honda CB400NA Superdream (current money puddle)
Honda CB500 K1 (second money pit)
https://www.sohc.co.uk/index.php/topic,28541.0.html
Honda CB400 four super sport (first money pit)
Link to my full restoration http://www.sohc.co.uk/index.php/topic,23291.0.html
This is a neat 500 restoration in the USA.
http://forums.sohc4.net/index.php/topic,151576.msg1731556.html#msg1731556

Offline DomP

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Re: Mixture screw direction
« Reply #47 on: Today at 05:41:12 PM »
I've thrown caution to the wind and set my airscrews to 1.5 turns out and gone for a 15 mile blast using more revs (rebuild has only done 150 miles roughly) in an effort to prevent build up on the plugs.  It goes well to be fair but is a bit hesitant pulling off from a standstill and if I accelerate after rolling off the throttle, a bit rich maybe? This is the first time I've ridden it since dropping the needles to their last setting, seems better to me.

Shall I turn the airscrews out another 1/8th turn and have another go, its not far off though I'd say.   

*one thing I forgot to mention, I had set the advance a bit past the last notch on the advancer so have set it dead on now.  My advance springs are a little too strong if anything, not sure how that might affect running.
« Last Edit: Today at 06:55:57 PM by DomP »
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

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  • Grogu
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Re: Mixture screw direction
« Reply #48 on: Today at 07:34:48 PM »
It wont hurt to try another 1/8 and judge what you get in effect. It's free and easy to do after all. The adjustment is setting the mixture at idle though so not much in response change would be expected. The above idle mixture and response is primarily the target of idle jet size overall.

Advance question, yes it will affect running as it needs to accumulate advance as fast as practically possible to run well. Thats within the bounds of combustion effects that limit this.

Effectively, the retarded position is just to calm it down at idle, making it civilised and smooth running when not pulling the bike along. If it stays retarded too long into rpm range, then it'll lack torque and feel flat in throttle response.

Try the change and test, you can always just turn them back to where they were.

Offline DomP

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Re: Mixture screw direction
« Reply #49 on: Today at 09:06:54 PM »
Will do, so do you think the tight springs (definitely been chopped and re-bent) might be causing the flat Laggy first bit of acceleration?   Finding new ones will be fun!
1975 XS650B
1976 CB550F1 current project
2012 Triumph Daytona 675

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Re: Mixture screw direction
« Reply #50 on: Today at 09:22:00 PM »
Will do, so do you think the tight springs (definitely been chopped and re-bent) might be causing the flat Laggy first bit of acceleration?   Finding new ones will be fun!

It won't help it at all. Presumably these will reach full advance point  ? Eventually  :)

The sooner they get into correct advance the more torque they produce, giving that more eager, peppy feeling to response.