Can anyone tell please me if it is possible to replace the float in a Amal twin carburettor without having to remove the whole unit and if so how is it done?
No such thing!
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Thank you Alan Osbom and as…
Thank you Alan Osbom and as you say undo the float bowl screws and then I could just pull the float out with ease, making sure I did not loose the little spacer and needle . I had to use a spot of Vaseline to gently hold the needle into place just below the petrol tap before sliding the float back in and replace the spacer before screwing back the cover.. The Vaseline was just enough to temporary hold the needle in place . After the float was pushed back the needle could be juggled about to release its hold so the float could then do its job.
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It takes some doing!
Roger,
It takes some doing and it's probably easier to remove the complete carby.
Im assuming you have a Mk1 concentric.
If you remove the complete carby, turn it upside down so you are looking at 2 Philips head screws. Undo these and the float bowl should come off. ( may need a slight tap with a block of wood or soft hammer)
The float should come off pretty easy from there.
Don't forget! Do not do the 5/16 nuts up tight when you reattach the carb to the Head! You will warp the carb body resulting in the carb jamming open if you do!!!!
Back to your original question. You need to get a screw driver onto those 2 Philips head screws and also have clearance to remove the float bowl if you want to remove the float in situ. It is quite difficult even if you know what you are doing. You even need to remove the fuel pipe banjo, which will probably leak when you put it back.
Sorry to be long winded, but that is just my nature.
Don Anson Melbourne Australia
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2 BA Allen Screws
Roger while you have your carb off you can take the opportunity to replace the 2 Philips head screws on the float bowl and also the 2 on the top of the carb with Allen Screws. Many places who sell parts for english bikes sell a little set of the 4 screws and an allen key.
After this dodge you can remove the slide easily and the float bowl slightly less difficulty with the carb on the bike.
Also when replacing the banjo, soak the nylon strainer in boiling water for a few minutes to make it soft to prevent leaks.
Don Anson
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Sounds like...
Sounds like yu are dealing with a monoblock carb. The lid on those comes off very easy (3X2BA screws?), Never found the need for Vaseline in there.
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No such thing as an Amal twin carburettor. There is Monoblocks, Concentrics MK1 and MK2, and Premiums. Usually we have one carburettor per cylinder, some times one carburettor feeding both cylinders. Either way you just undo the float bowl screws and there is the float!