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+--- Thread: Zenith VA26 carburettor problems (/showthread.php?tid=2472)
Zenith VA26 carburettor problems - John Mason - 01-03-2019
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.
RE: Zenith VA26 carburettor problems - Ian McGowan - 04-03-2019
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" ???
RE: Zenith VA26 carburettor problems - Reckless Rat - 04-03-2019
Either that or one of the jets in the bottom of the float chamber is blocked.
RE: Zenith VA26 carburettor problems - Steve Jones - 04-03-2019
Again, typical of an inlet side air leak. Before looking at the more obscure things, always check the simple things first.
Steve
RE: Zenith VA26 carburettor problems - John Mason - 04-03-2019
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
RE: Zenith VA26 carburettor problems - Reckless Rat - 04-03-2019
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.
RE: Zenith VA26 carburettor problems - Pricey - 05-03-2019
John
I had a similar issue which I posted about here http://www.austinsevenfriends.co.uk/forum/showthread.php?tid=1458&page=3
My issue was the emulsion block which when lapped into the carb body cured the issue.
See this article http://www.da7c.co.uk/technical_torque_articles/zenith_26_va_carburettor.html
HTH
Cheers
Dave