An annoying problem has developed with this Weber. This carb does not appear to have any kind of throttle return spring, so I'm not sure what force is acting on the throttle linkage to close it. What's happening is the linkage doesn't seem to be fully closing down to idle speed, so when I'm slowing down, the idle will sometimes stick anywhere from 1000 - 2000 rpms. A quick blip of the gas pedal will get it to return back down to 800 rpms, but it's annoying. I've adjusted the tension on the throttle cable itself, and there's enough slack in the linkage that I don't think it's the cable, especially since when I blip the gas pedal the idle drops down to where it's supposed to be.

The stock Mikuni has a throttle linkage return spring on it, so I figured it couldn't hurt to try and put one on the Weber. I found a threaded hole on the intake manifold, towards the back, and put a bolt in there with a spring that goes up to the Weber throttle linkage. A friend of mine is out driving the Monty, so she's the guinea pig to see if this spring is going to work.

When I was at the hardware store looking for a spring, I had to keep in mind that it had to have enough tension on it to close the throttle linkage, but not so much that it would make it difficult to open. I'm not so concerned about WOT operation, since it most likely will hardly ever see that. The 90 percent solution for daily driving is what I'm going for here. I'll try and post a pic later, but I'm keeping my fingers crossed that this will work.

UDPATE - looks like the spring trick worked. The rpms dropped down like they were supposed to every time, no need to blip the gas pedal, had a nice steady idle around 800 rpms.

This pic shows the spring runnning from the throttle linkage down to the bolt on the intake manifold. The head of the bolt is barely visible around the 6 o'clock position, below the "C" in the Gates Corporation wording on that large black rubber hose:


This pic shows where the spring is attached on the throttle linkage itself. Instead of hooking it in the same cradle where the throttle cable goes, I just put it around the arm that goes into the linkage: