Installed the Webers - its running!

[68gt500]

I got them installed an running .



First test ride showed it way lean on transition (about 1600 rpm)

My supplier could not get the idle holders in the specified 100 size, so I tried the stock 120s - not good.

So I soldered the 120 shut and drilled new 1mm holes.

Runs much better now but still has a lean hole at about 3000. I still have to check ignition advance, since my distr. was optimized for vacuum advance.
Probably need more initial.

My setup now is:
Idle 65
Idle Holder 100

Air corrector 120
Emulsion Tube F16
Main Jet 150

Venturies 40 mm

Basically a copy of Stefans "mallorca special" but using F16 because I could not get the F14

What would you suggest as next step to get rid of the 3000rpm lean spot?

Yes, I do have a wideband O2 to check - great tool btw.

[ENTDOC]

lean at 3000 would indicate main jets that are too small, try 160 or 165's. Air corrector should not come into play untill later

[Eljaro]

Hi Mike,

the fact that my self made F14 tubes use the F7 tube as the basis, with the bottom holes partially covered up and new ones made at the top probably makes a difference.
I say partially, because the sleeve which brings the outer diameter of the tube from 7.5mm to 8.2 covers up all the bottom holes, but the ones at the top of the thick part are directed upwards at an angle, and so come out where the tubed is thinner. The small gap between the sleeve and the thin part of the tube lets some air through.
You can allways drill the center hole in you F16 emulsion tube deeper and drill some holes on the side, at the height where the top holes in the F7 tube are. First you drill 2 and try it out ,then 4 and if that is not enough 8.
It is trial and error here.
How bad is the 3000 rpm leanness? Do you notice it or do you only see it in your O2 gage.
I am using initial 18-20º timing.
stefan

[68gt500]

Thanks guys!

@Stefan, its not a lean spot, its a hole, it back fires when I go thru it slowly. The AF Gauge reads 16.

Is the main jet already "working" at 3000?

Above 3000 it feels real good, AF right arround 13-14

Weird, after reading all the stories about the over rich transition - I end up with a lean spot...

Should I try the 3rd progression hole?

[68gt500]

Update:

I habe replaced the F16 with the orig. F7s and the car ist pretty much drivabele now. Still has a lean spot at 2300-2700 but not too bad.

The rest is more on the rich side (AF 11-13)

I still need to richen up the lower transition - but lean the rest - 3rd transition hole ??

Can s.o. explain the relationship between the idle jet and the idle jet holder (air hole)

Current setup
Idle 65
Idle Holder 100
Emulsion Tube F7
Air corrector 120
Main jet 150