Dual Weber IDF 40s, Carb Rookie question... Options

[malcolm2]

Hello everyone. I will preface by saying that this is an engine from a 914. (IMG:style_emoticons/default/piratenanner.gif)

But it is in my VW Bus. Just now getting it moving down the road. Everything is new.

Carbs are new and I am a carb rookie, as well. Bought them from Aircooled.net and had them cleaned and set-up for the bus. My 914 has L-Jet FI, this group has taught me enough about that system to be dangerous.

So here is my question for the carb experts. What should the Pump Valve spray look like? It seems erratic and drippy. It kicks in 1st as I open the throttle, not a spray but pore, really. I will say that I see that in all 4.

[Superhawk996]

I should have mentioned 10mm correlates to a higher fuel level in the bowl as you correctly inferred.

FWIW - 10mm seems too high to me. CB Performance IDF guide suggests 14mm. That seems low but again it’s all relative to what your engine wants.

You need to figure out why your plugs are black.

I’m guessing . . . but assuming . . . you don’t have idle mixture screws and throttle plate position set properly as you’re trying to tune idle. If your idle speed screw is holding the throttle blade above the 1st transition port, you’re going to pull in too much fuel at idle and lose throttle response.

Once you get closer to an ideal tune, then float level can be used to tweak slightly richer / leaner but at this point - let it go. You’re close enough.