jason_child

does anyone on here have any tuning advice and i cant seem to find the balance screw

"if the rearmost carb is drawing less air than the front, turn the BALANCE SCREW in a clockwise direction to correct this"

jason_child

btw this is on a 12a street port with headers full exhaust ignition and so on

Latin270

Best piece of advice is by a Weber tuning book and learn about these carbs. Pretty simple in design but understanding how the thing works is the tricky part. I bought the Dellorto tuning book and so far I tuned 2 Mikuni's and 1 Dellorto to run better than ever, not to mention now I am able to rebuild them. Just bought a Dellorto 48 so I am looking forward to taking it apart and rebuilding it.

JoseReyes

You probably mean the idle mixture screws. They are the ones witht he spring in them. Best advice is to get a book. However, I have a 45DCOE in a 12A Street Port. All carburetors behave differently. So you will have to start from scratch. What are the setting right now? idle jets #, Main Jet #, Emulsion Tube, Air correctors, chokes, auxiliary Venturies, etc.....

You need to know these in order to get a starting point. Here is what I have in mine:

idle jets=60F9
Emulsion Tube=f11
main 185
Air Corrector=190
Needle & Seat=2.50
Pump Jet=45
Chokes=40
Auxilliary Venturies=4.5
Fuel Presure = 4.0psi
Vacum Advance disconnected
Timing 8-10 degrees advance
idle between 900-1000rpm


with these setup and rB single exaust I am pulling 137 to the wheels and 167 to the flyweel...

To find out about all these you will need a book on how to tune the webe/dellorto carburetors..... well worth the money...

Dan_s_young

iTrader: (1)

^^^ have you tried F9-65 idle jets? Im just wondering why everyone seems to be using them on a stockport, but yet you are having good results with the F9-60's with a streetport. These carbs are VERY simple in design and yet they still are a pain in the *** to tune. (unless you have done it before...)

My current jetting is like this:
idle jets=60F9
Emulsion Tube=f11
main 170
Air Corrector=155
Chokes=36mm
Fuel Presure = 4.0psi

I haven't gotten a good run with the current jetting but I am pretty sure it is getting close... What I have done and I kind of suggest, I started a duotang with notes to myself. I write down jetting combinations and record how they work in the car, I record if the header is glowing or if it smells rich etc etc... It seems to be a pretty good idea, you can go back to previous jetting settings to find your optimial settings. But splurging for a wideband will also make tuning a carb extremely easy... I wish I had one...