Black soot in my exhaust Options

[terrymason]

I fired up my 914, and let it idle in the drive way for a while, and noticed that small dots of black stuff (looks like oil splatter) seem to come out and stain the concrete. These aren't liquid at all, but are a black powdery soot.

Is it normal to have these black soot marks? Do you think this is because my car has sat for some time?

[Joe Ricard]

You should be aiming for 14:1 at idle, as adjusted by the air correction screws. Some where around 1 1/2 turns out.

Now go for a cruise and watch your AF meter. you should be hovering in the middle of the the gauge at 2500 RPM part throttle.

If it's rich you will need smaller jets on the idle cicuit.

It it pops and stutters as you push on the gas an the gauge peggs lean then you need to increase acceleration volume. Turn in the nuts on the linkage to the acceleration linkage (middel of the carbs)

Next after all this is sorted go to the main jets and find a place to safely hold it full throttle and see how it goes. and adjust main jets.

2.0L should be around .50 idle 130 main 200 air. But this is so subject to air temps and humidity.

I just went down to 135's from a 140 yesterday 40 degrees this winter I could pour on the gas now I can't I also hogged out a set of air correction jets to like 250. But I like to think I know what I'm doing ans why.