Carburetor Mystery Screws

[3Phase]

There is a mystery screw threaded into each throttle return spring retaining boss just below the throttle shaft on my '80G carburetors.


Mystery screw in #4 carburetor



Does anyone know what the screws do? <hopeful look>

They do not seem to hold the throttle return springs in place and on my carburetors they're all too tight to remove without splitting the rack. I would rather not do that just to satisfy my curiosity.

[DGXSER]

Hey Scott,

Jusr so happens I have a set of parts carb bodies in the work shop. So I pulled one aprt and removed that screw. Is is simply a screw in a boss, same boss is on the other side of the carb, just no screw or threads cut in it. The screw serves to extend the boss as a stop for rotation of the throttle plate.

Don;t ask em why it changed, but on the 78-79 Mikuni carbs, they simply made that boss longer on both sides to serve the same purpose.

[3Phase]

Right on, thank you!

I moved the throttle by hand and I can see the throttle assembly touches the screw on the #3 carburetor boss at WOT but the other ones are not even close.

I'm getting that bizarre roadrunner/coyote kind of feeling; like something relatively simple needed to be done but it got too complicated too quickly, went off a cliff and landed in front of a rock wall with a painting of a train tunnel on it ....