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correct air slide 389?

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correct air slide 389?

Posted by john_day at November 13. 2017

is this the correct air slide[choke]

seems to be smaller than I remember....it's brass

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Re: correct air slide 389?

Posted by ian_soady at November 13. 2017

Looks OK to me. As long as it retracts fully so it doesn't protrude on WOT and is able to go down fully it should be OK.

Re: correct air slide 389?

Posted by George Phillips at November 13. 2017

Looks much like mine  - '55 ES2. George

Re: correct air slide 389?

Posted by john_day at November 13. 2017

Many thanks! I just thought it didn't restrict air flow much

Re: correct air slide 389?

Posted by rod_thompson at November 13. 2017
I don't know what the other two could see but the air slide appears to be missing! Only the brass guide tube is there. Here is a link to an illustrated parts list: http://amalcarb.co.uk/generic-389-monobloc.html Rod

Re: correct air slide 389?

Posted by ian_soady at November 14. 2017

I think you're right - I hadn't realised the magnification was so much! Of course the slide should fit quite nicely into the hole in the throttle slide that we can see.

Well spotted Rod.

Re: correct air slide 389?

Posted by john_day at November 14. 2017

a better photo, there is a guide and the brass slide is shown in the down position, but if memory serves me right, it is smaller than on previous bikes[mind you are going back 50 years!]

the slide goes down and does restrict the air a bit, but there is nothing to support it......it just hangs loose

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Re: correct air slide 389?

Posted by john_day at November 14. 2017

and a rule behind it

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Re: correct air slide 389?

Posted by ian_soady at November 14. 2017

The slide usually locates in that cutout in the throttle slide and is a sort of top hat section so I think what you're showing is incorrect.

You can see it on the link Rod posted.

What you have does look similar to the one I had on the 1931 Sunbeam I restored recently but TBH I can't remember exactly what that was like (Amal Type 74 carb).

Re: correct air slide 389?

Posted by George Phillips at November 14. 2017

Oops! My apols, John. Rod is quite right. I've just been down and shone a torch up the carb orifice and the air slide completely covers the width of the opening, stopping short at the bottom to allow some air through. Like Ian, I was misled by the scale. George

Re: correct air slide 389?

Posted by john_day at November 14. 2017

Many thanks again, I wonder how many other 'problems' I'll find before I get it on the road........ I bought it in good faith from a chap who said he had it running beautifully but because of ill health couldn't ride anymore!

still it will keep me out of mischief this winter.

And a very strange tank fitting!

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Re: correct air slide 389?

Posted by ian_soady at November 15. 2017

Funny, that's what the vendor of my ES2 said....... I have yet to seriously delve inside but am not encouraged by what seem to be metric Allen screws holding the rocker cover on.....

The tank fitting will provide a source for making new nuts.

Re: correct air slide 389?

Posted by Dan Field at November 15. 2017

It should run ok without the choke slide but you should remove the brass guide and cable and seal the carb top with a small nut and bolt.

Re: correct air slide 389?

Posted by Barry Carson at November 15. 2017

i removed my choke slide and associated parts and just siliconed the hole that was left it worked ok .

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