I have the standard Weber w/electric choke on my Brat. Bought it brand new and was pretty much was a direct bolt-on without any fine tuning.

 

When the choke is engaged the thing runs awesome. When it warms up it seems to lack what I would have expected to be a bit more power/pickup.

 

I do have a feeling it's running on the rich side. Could out of adjustment mixture do this or is it more likely something else?

Could be running lean, try adjusting the mixture. I run mine a bit rich, like 2 1/2 turns from fully closed, and it works for me (nice rolling black smoke from the stacks when I hit the gas )

 

If you dont have the tuning equipment like a carb shop (I assume you dont ) then play with the mixture screw, timing, and idle screw until you like it

 

-Bill

I do have a feeling it's running on the rich side. Could out of adjustment mixture do this or is it more likely something else?

 

Check your plugs. Black electrodes mean you're running rich.

 

The mixture screw shouldn;t be more than 2.5 turns out, if so check your jets.

 

it seems to lack what I would have expected to be a bit more power/pickup.

 

I wasn't too impressed with the weber either. I assumed it was going to be a performance upgrade, but in all reality, i would only recommend it to someone with a crapped out stock carb.

 

I have less into my EJ swap, than a new weber conversion would cost.

I'd go that route if you want any real difference.

The mixture screw is only for the idle mixture - which can affect the transition from idle circuit to primary but will not affect anything once the throttle has been cracked open.

 

If you want to make changes to the primamary and secondary circuit mixtures you will need to start changing jets and air bleeds. I sugest investing in a wide-band O2 sensor for tuning if you are really serious about it - takes much of the voodoo, ritualistic magic out of tuning carbs.

 

The Weber is a good choice for replacing the stock carb if carb technology is what you are looking for (and many folks are). It's not a "performance" enhancement and never has been touted as such (at least by me). It will increase your off-idle torque simply due to the progressive linkage and many folks have mistaken this for a performance increase - in a way it is, but the HP of the engine has not changed appreciably. It makes them feel a bit more sporty and sometimes that's all they need. If you want real performance increase the Weber is *capable* of supporting the mods neccesary for it - porting and polishing, and cam changes being the most common. The 32/36 can nicely accomidate modifications if you rejet it as you go. The stock carb cannot.

 

The SPFI is a better choice in my opinion as it will do everything the Weber will do but requires no tuning even for mild performance modifications.

 

GD

When I was last looking into widebands, I found a couple of tuner shops that would rent them for a day or two, installing them as well.