Lancia Motor Club Forum Banner
17 November, 2019, 11:39:16 PM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Search Calendar Register  
Pages: [1]   Go Down
  Print  
Author Topic: Aprilia "big Zenith" carburettor  (Read 1654 times)
0 Members and 1 Guest are viewing this topic.
Tony Stephens
Senior Member
*****
Offline Offline

Posts: 131


« on: 03 July, 2013, 07:37:59 PM »

I have unearthed what I expect will turn out to be a "big Zenith" conversion, as we used to call them in the 1970's when my Aprilia ARX 560 had one. Unable to get it to run properly on the carburettor, I dropped it in at Zenith in Honeypot Lane London NW, and they rebuilt it completely, jetted it appropriately for the Aprilia from their records,  and gave me a bill for just over £3, after which the car functioned perfectly. From my researches/recollection, the model no is 36 VI9, a downdraught version of the sidedraught 36 VI2 which was fitted as standard to prewar Riley 1 1/2 litre cars if you didn't have SU's.

Firstly:are my part numbers correct - can anyone provide a web link to information?

Secondly, what should I pay for such a carburettor if in good condition?

Thanks for the help

Tony Stephens
Logged
DavidLaver
Permanent resident
**
Offline Offline

Posts: 3898



« Reply #1 on: 03 July, 2013, 09:19:06 PM »


What to pay?   A problem that is often resolved with a swap...

David
Logged

David Laver, Lewisham.
BlueSky
Lapsed
Senior Member
*****
Offline Offline

Posts: 183



WWW
« Reply #2 on: 03 July, 2013, 10:20:30 PM »

Tony,
36-VI2 (that's vee eye two) is the downdraught version, I have a copy of a manual that covers it on my web site http://www.narrywoolan.com.au/home/Aprilia_Publications.html
My Aprilia had one fitted when I bought it so don't know what you should pay for one. You'll also need an adaptor for it to fit the inlet manifold.
Noel
Logged

1937 1st series Aprilia Berlina
Nissan X-Trail T31 TS
1920 P & M 3 1/2hp {FOR SALE}
John Deere LX188
www.narrywoolan.com.au/home
Tony Stephens
Senior Member
*****
Offline Offline

Posts: 131


« Reply #3 on: 04 July, 2013, 07:33:38 PM »

This is really helpful (and the website added to my collection of Aprilia literature - websites didn't exist when I was last around Aprilias).

Keep coming with the information!

Thanks

Tony
Logged
welleyes
Member
****
Offline Offline

Posts: 53


« Reply #4 on: 10 July, 2013, 07:54:12 AM »

VI2..... and we are still having trouble getting ours to idle consistently. Tried everything we can think of but it is still inclined to stall. It is 'correctly' jetted. It hunts as though too rich but seems correct above idling revs. It is especially prone to cutting out when making a stop in traffic; at a roundabout , for example. Frustrating!

Andy and Stuart Tallack
Logged
lancialulu
Press Officer
Permanent resident
*****
Offline Offline

Posts: 3597



« Reply #5 on: 10 July, 2013, 09:35:42 AM »

VI2..... and we are still having trouble getting ours to idle consistently. Tried everything we can think of but it is still inclined to stall. It is 'correctly' jetted. It hunts as though too rich but seems correct above idling revs. It is especially prone to cutting out when making a stop in traffic; at a roundabout , for example. Frustrating!

Andy and Stuart Tallack

Just a thought but check ignition timing as if too advanced it will have tendancy to stall.
Logged

Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
BlueSky
Lapsed
Senior Member
*****
Offline Offline

Posts: 183



WWW
« Reply #6 on: 10 July, 2013, 11:09:59 PM »

Andy & Stuart
A few things to check if you havenít already. Make sure there arenít any leaks in the float, a recent problem I discovered that was causing the carby to flood. Take it off any see if it has any fuel in it and put it hot water to see if any air escapes. Along with that the needle & seat could be sticking or worn. Make sure there are no air leaks in the manifold connections and double check the float bowl gasket isnít blocking anything.
The jets fitted to my VI2 are:
Main 115
Compensating 85
Starting 120
Economy 150
Slow running 65

Noel
Logged

1937 1st series Aprilia Berlina
Nissan X-Trail T31 TS
1920 P & M 3 1/2hp {FOR SALE}
John Deere LX188
www.narrywoolan.com.au/home
welleyes
Member
****
Offline Offline

Posts: 53


« Reply #7 on: 12 July, 2013, 02:40:00 PM »

Thank you, chaps!
Jetting is the same as you gave us, Noel; except that main jet on ours is 110.
We have just re-checked ignition timeing and it probably was a bit advanced. It now needs a road test but we are ony a few miles from Goodwood and the FoS is on. I gather there are holdup on all the roads heading in the Goodwood direction and it is difficult for us to find a road that isn't being used as a cunning (but ineffectual) short cut. It will have to wait till Monday.

Andy and Stuart Tallack
Logged
Pages: [1]   Go Up
  Print  
 
Jump to:  

Contact the Forum Administrator

LMC Forum copyright © 2007 - 2018 Lancia Motor Club Ltd

Powered by SMF 1.1.20 | SMF © 2006-2011, Simple Machines