Carbs Install

[Multiman]

Maybe try a bit of gentle heat?
Could do with heat gun but probably safest in the oven.

[Oddjob]

Heat gun, you want the surrounding metal to get hot, not all of it. If the screw expands faster than the slide it would stick harder.

[Martin6]

None of the screw is showing out the bottom. I didn't know I could still get hold of just the slide. Will look at that.

[Oddjob]

They'll be a few members around with broken 750 carbs, I'm sure one will be able to source one if you ask. Just make sure you quote the number printed on the base, usually

[Martin6]

I put a punch upside down in the vice, sat the screw head on it, then drilled the screw out from the underneath face, tapped it for a larger screw and opened the stay plate hole a fraction. So that bit is sorted.

However, the carb's slide cylinder is quite badly corroded. It is a really stiff slide. Really stiff. So I have found the reason for my stiff throttle and unwillingness to self return. I touched it with some emery cloth and autosol and not much difference. So i hit it a bit harder. Better, but still quite a bit stiffer than 1-3. I've no idea if I've damaged the vacuum / air seal, could well have done. I took off as little as i could, but it was quite bad. I'll crack on at the weekend and then see if it runs OK.

I may need a new carb after all , I really hope not.

[Martin6]

They'll be a few members around with broken 750 carbs, I'm sure one will be able to source one if you ask. Just make sure you quote the number printed on the base, usually

Thanks. Hoping not, I'll soon find out!

[Oddjob]

Ask on the site in the desperately seeking section and see if anyone has a spare carb body for that cylinder, you'll need the carb model number which will be stamped into the body somewhere, on the 500/550 it's on the mounting flange, usually 3 numbers and a letter. If you want cylinder 4 for example you must ask for number 4 carb to replace your existing one.

[Martin6]

👍

[Martin6]

In my carb rebuild kit there is a small o-ring and small washer. Can't for the life of me see where they go. Any ideas?

[Nurse Julie]

In my carb rebuild kit there is a small o-ring and small washer. Can't for the life of me see where they go. Any ideas?

Carb sync port hole screws?
Edit... Or on the top of the carbs? Can you post a photo?

[Martin6]

Hope this comes through.

[Oddjob]

Is there anything on the air screw, there's usually something on them but the parts book doesn't show it.

[Sesman]

Float bowl drain oring and inlet manifold vacuum screw? The prize is mine.

[Martin6]

Float bowl drain oring and inlet manifold vacuum screw? The prize is mine.

Thank you. Is that the screw that plugs the hole used for vacuum guages?

The prize is a trip to Essex to balance my carbs

[Oddjob]

Except the float bowl sealing ring is shown as being alloy in the parts book.