Where the %&$#@ does this spring go?

[Airy_Mtn]

Just bought an old Craftsman 917.254860 lawn tractor with the B/S 422707 twin. It wasn't running so I pulled the Walbro carb (not sure of type but it has the three screws on the fuel pump) and cleaned the needle and seat and every other orifice I could. As I was reassembling it there was a small 1 in. long spring in the pan that I hadn't noticed or disconnected. I have no idea where it might go as there seems to be not connecting linkages that fit.
The mower runs now but the throttle seems unresponsive and there is a slow surge. I can't imagine this spring comes from the governor or it never would have made it into the shop along with the carb.
Any help would be greatly appreciated. I'll include a picture of either side of the carb and the spring in the manual which does not show the location.

 

[Airy_Mtn]

Just doing some more sleuthing and found a post with two other folks with the exact same issue here

Briggs 422707-1214-01 Carb Spring?

Looking for help. 'Inherited' a 2003 Deere L120A with a swapped out engine - 18HP IC Briggs 422707-1214-01. The entire mower was in boxes and I've successfully got most of it back together after replacing a kludged wiring harness, magneto, and alternator. The carb is a 3-screw type. I've got...

www.houzz.com

Def not a gov. spring but what the heck is this thing.

 

[Scrubcadet10]

That is your governed idle spring, i believe it hooks to the governor arm on the front left side of the engine, i can't really describe it well, but i have a opposed twin that i can take picture of to show you how and where the spring goes.

 

[Airy_Mtn]

If you could post a pic I would sure appreciate it as I am stymied.

 

[Scrubcadet10]

here's a quick snip out of the manual
check to be sure that governor spring is in place

 

[Airy_Mtn]

Appreciated but that is not it.
My third pic doesn't really show it well but the governor springs are all much heavier and are in place. This had to come off the carb because that's all I took into the shop. The link I posted has a pic of the spring. It's really quite light weight. I saw one carb where there was a spring of similar size to pull the throttle back onto the idle set screw but mine doesn't have an opposing anchor point to the front of the carb???

 

[Scrubcadet10]

Ooh yeah, that's a pretty light spring

 

[Ken22]

I have an 18TwinII on my Case 446. I cleaned the carburetor 2wc and it was still surging. Then the fuel pump started leaking so I bought a new carburetor and now it runs great. The original had 3 bolts on the fuel pump and the new one has 4 so either will work. I'll look and see if I can spot that spring on my engine.

 

[Rivets]

Please provide engine type and code numbers.

 

[ILENGINE]

I wonder if that is not item 232 which could fit over the top of 202 in his posted diagram. Acts like a anti vibration spring to stabilize the throttle linkage.