Originally Posted by blown50
If that is where ur blades are sitting at idle, then you need to readjust your idle settings! As the idle setting is the most critical on a weber. And no don't drill any holes unless you have a narrow lobe separation cam! AKA BIG CAM! And I'm sure you don't . Try the idle adjustment, it should be in the papers with the carb, did you recheck your timing? Fuel pressure? Go back through the install one more time, I bet you will find what is wrong. Webers are good carburetors, but I'm sure there can be bad ones, but do the recheck first! Also check the PVC and be sure it's working If its not working or not hooked up this can cause you to have to idle the carb too high. But read and re read the idle setting adjustment, it tells you what to do step by step. If it doesn't idle with the plates where they should be, then it may be time to send it back
I "think" I see the throttle plate(s) above the progression holes.
The idle setting is most critical on a Weber.
Get your engine running and slow the idle down as slow as you can get it.
THEN, reset the timing, this should stablize or even increase the idle speed.
If you have a vacuum guage, put it on the vacuum advance source on the carburetor. This is to the right of the choke and down on the mounting flange.
At idle, which is absolutley no more than 1/2 turn in on the idle speed screw, you will have ZERO vacuum reading from the ported vacuum source.
THEN, you should find the "Lean Best Idle" or the "Sweer Spot" where the engine idles the best.
No more than 1/2 turn in on the Speed Screw,
ZERO vacuum at the ported vacuum source,
Re-set the timing,
Find "Lean Best Idle".
Some use a .50mm idle jets and some use .55mm idle jets.
Float height of 18mm from gasket to the top of the float. (do not depress the ball and spring inside the needle valve)
Let us know where your settings are.