Joined: Dec 2017 Posts: 1,160 Threads: 68
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Location: Nottinghamshire. Robin Hood County
Car type: Austin Ruby Mk1 1935
01-03-2019, 08:57 PM
(This post was last modified: 01-03-2019, 09:07 PM by John Mason.)
Hi all, I have just now put a new choke spring on the carburettor of my Mk1 Ruby (Zeneth VA26). The choke now works well but I have a problem with the carb. When the engine has warmed up there is a big flat spot from tick over to the engine reving up so much that it cuts out unless the throttle is feathered quite a lot. I have checked the tappets, timing and points and all are correct as I believe they have to be before adjustment to the carb. My question is what do I adjust.
One further point to to eliminate all possibilities I have fresh petrol in the tank.
John Mason.
Would you believe it "Her who must be obeyed" refers to my Ruby as the toy.
Joined: Aug 2017 Posts: 254 Threads: 3
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Location: Shropshire, UK
Hi John, working on the basis that it, presumably, ran OK before you had the carb off to fit the new choke spring, I suggest that you possibly have an air leak at the carb/ manifold joint. Working on the principle of "what Have I done that could possibly bugger it up" ???
Joined: Aug 2017 Posts: 2,400 Threads: 33
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Location: Deepest Frogland 30960
Car type: 1933 RP Standard Saloon
Either that or one of the jets in the bottom of the float chamber is blocked.
Joined: Aug 2017 Posts: 1,462 Threads: 26
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Location: North Yorkshire
Again, typical of an inlet side air leak. Before looking at the more obscure things, always check the simple things first.
Steve
Joined: Dec 2017 Posts: 1,160 Threads: 68
Reputation:
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Location: Nottinghamshire. Robin Hood County
Car type: Austin Ruby Mk1 1935
04-03-2019, 08:54 PM
(This post was last modified: 04-03-2019, 09:42 PM by Timothy P.)
Thank you all will check for air leaks and blocked jets (wish I had an air line). I do however have a can of pressurised carburettor cleaner with a plastic tube extension.
John Mason
Would you believe it "Her who must be obeyed" refers to my Ruby as the toy.
Joined: Aug 2017 Posts: 2,400 Threads: 33
Reputation:
36
Location: Deepest Frogland 30960
Car type: 1933 RP Standard Saloon
The two jets in the bottom of the float chamber are removeable - one of the screws holding it on to the carb body should have a squared end - use that to unscrew the jets.
