The air corrector jet has influence/ effect over the overall fuel mixture at high RPM's. A change in 3 sizes [larger] of Air jet is approximately the same as changing one main jet size [smaller]. 190/200 would be a fair starting point

The idle could almost be considered the most important jet as most of your driving will be through this jet. The idle jet supplies fuel to the idle and progression ccts i.e [part throttle movements].

On a side note the 32mm chokes will help with low end [torque] drivability as it maintaines mixture velocity, but you will suffer at the high RPM range. I would suggest 36mm for race and 32mm for street, 34mm would be a nice for a bit of both worlds.

hope this helps.

cheers
Benny

yer thanks i read that article before it has a lot of good info. I really want to know if i will have to change my air corrector to a smaller one as 240 is too big i think. Does anyone know what an oversized air corrector will actually do to the performance of the carbys? and will i need to change it to a smaller one?

Hi, have a look at this web page it is full of useful info for dellortos
http://www.datsun.co.nz/phpBB/viewtopic.php?t=2429

Hey guys
im putting twin 40mm dellortos onto my new worked A15 which will make 130-140hp and need some help with jetting?
The current jets are these-
32mm chokes
7772.10 emulsion tube
145 main jet
240 air corrector!!!!!
55 idle jet

i think they all seem ok except the air corrector is huge isnt it? What will be the effect of this air corrector?
What jetting do you guys using webers and dellortos use?
cheers