Hi all,

I am changing over to a Weber carburettor for my 1275, just to give it a go over the HS6 I have on it currently.
I will be buying new - and the guys I am buying off say they can jet it to suit when I buy it.

So I ask you all: what is a good base tune for my engine?
It's a large journal 1275, standard head (A+), 123 distributor. Everything is standard apart from that.

Any help greatly appreciated.

As for manifold, it will either get a swan neck, or a 3 inch style.

Cheers.
Tyson.

i`d suggest the redline/warnford 3&1/2 inch manifold

& just as a starting base-->

idle jets-50F9
pump jets 50
block off the pump by-pass jet (inside the bottom of the float bowl)
aux ventures 3.5
chokes 34
emulsion tubes F11
mains 145
air correctors 180

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Yeah sounds good here too ...
Except I use 4.5 aux ventures

Matt you say block off the pump bypass Jett , how do you do this and why

Cheers
Beanie

_________________
I am the son of the STIG

HOTBRICKS
http://hotbricks.org.au/

'65 NCF MINI.....
'69 MINIMATIC.... 9 year resto still on the go

Beanie,
The reason this is done is to get more fuel per pump stroke by shutting the bleedback to the bowl. This is needed on a siamese port engine because you have 2 cylinders sucking on each port, not 1 as with an Alfa for example.

With a Dellorto 45 you achieve the same result by increasing the pump stroke (adjust actuating rod locknuts).

_________________
DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.