Sticking Slide

[Angus]

I have finally got around to working in the 1960 A10’s sticking throttle slid problem.
I think this will now generate a few questions; I will start with the original planned job.
I had thought and planned that the body had distorted due to over tightening as per many thread on here. However having got the carb off I am not too sure. There appears to be a dull darker grey deposit about 1.5 centimetres down from the top of the body. The slid once past this appear to be a nice fit in the lower part of the body which is shiny. It appears quite hard (won’t move with a finger nail).
So my first job I think should be to remove this any ideas what it is and the best way to remove it.

 

[chaterlea25]

Hi Angus,
First question, Is the petrol tank lined with sealer?
This can and does partly dissolve in the "petrol" only to solidify on the throtthle slide and worse on the inlet valves
Try some petrol or acetone (nail varnish remover on the slide/ carb body to remove the gunk

HTH
John

[muskrat]

I agree with John. You will find that the patch is just above the top of the slide at normal road speed throttle openings. As things wear the particles mix with the fuel (and additives) to create a paste which may be what you see in your carb.
I suggest liberal uses of full throttle to stop this  .
Cheers

[Angus]

Thanks guys,
Muskrat; could not use full throttle as it would never shut down it sticks at the top which is why I thought is was distorted + its winter cold and wet with salt on the roads thus now is a good time to cure it. Your right at normal road speeds position it is clean and shinny.
John; no the tank is not lined with anything, its almost like a ring of corrosion round the top quite rough and hard. I have tried petrol, will give nail varnish remover a go tomorrow
Thanks

[bsa-bill]

Try some petrol or acetone (nail varnish remover on the slide/ carb body to remove the gunk

well I've read a lot of good posts from chaterlea25 so reckon he's ok, but I generally gives bikers who know here the nail varnish remover is a wide berth
Know what I mean John

[morris]

Could give it a try with a non abrasive metal polish. I did my sorry looking black and brown stained carb slide with it and it came out as new, now going up and down in the bore like oiled.
This will also avoid painful questions from the wife when she finds out you nicked her nail varnish remover...

[chaterlea25]

Hi Bill,
Being outnumbered by women in the house, I have to find some compensations !!!!
FFS even the dog is female

John

[duTch]

This will also avoid painful questions from the wife when she finds out you nicked her nail varnish remover...

 ..or explaining why you have nail polish remover, and she doesn't do nail polish...

 You could also try Carby cleaner, which could well be full of acetone anyway...??

[gold33]

Be careful sneaking the nail polish remover; most are acetone free now a days so you'll have some explaining to do! 
I had a similar problem with my 376 AMAL. I figured the cause was the additives in the Shell Optimax fuel I was using (fuel lines weren't too happy either), switched to BP premium where ever possible (Ethanol in all 91 octane in my area) after a clean with carby clean, seemed to sort the problem but I only used that carby for a very short time after the clean out.

[Angus]

Well all nice and free now snaps open to the top and shuts down. Used some very fine emery cloth the remove what ever it was at the top, nothing else touched it.  So put it back on the bike, which generates two new questions. I am sure I used to be quite good at this, now it seams if I try any thing close to spannering I just make it worse.

[Topdad]

Don't despair Angus, I can't even read properly these days !! *problem*cheers BobH

[berger]

just thought I would post this In the correct place for sticking slide, wonders never cease I found the correct thread I rebuilt my monoblock a few years ago ready to fit on the bike , but then decided on the mikuni. I lightly oiled it and the brand new slide was working well, I then wrapped it in rags and put it in a wooden box in the shed . I found it today and the slide was stuck and after taking it ALL to pieces spent a couple of hours with wet& dry to get rid of what must have been zinc/ally oxidation build up, not really visible to the eye but it was there after I had washed everything in petrol and given it a good tooth brush scrub . not a problem really   [ what else would I have been doing? PUBS ARE SHUT! ]  but it just goes to show how atmosphere over a few years stops something working that I thought was sorted with its oil film protection, looks like I need some of those vacuum jobbies proper engineers use. thankyou for listening , have a nice time doing whatever you are doing