422707-121401 sump gasket

[McTurff]

Couple questions:
Can you hold the carb linkage at idle and get a slow idle? (I'm talking about holding the carb shaft against the idle set screw)

Next: You mention that yours runs at high rpm even with the dash control set at slow. If so you have a throttle plate control problem instead of a governor problem.
In post #31 and 33 I posted that I my opposed twins will slow idle with the dash control set at slow and the governor not even needed. The governor arm is actually locked out mechanically and not even used at slow idle on mine,(cannot even move the governor arm with hand because it's locked mechanically at low idle) but does have a governored idle part way up on the dash throttle.

My engine model types and codes are as follows 422707 1263 01, code 9403105A and 42E707 2631 E1 code 9811235B and both use the same governor arm and throttle plate and springs.

Your engine shows on parts lists that it uses the same governor arm and throttle plate as my engines. (but Briggs does have other type throttle plates and governor arms for the opposed twins and they must be kept matched for correct mechanical governor/throttle operation)

Post up some good pictures of your governor arm and throttle plate. I see that Briggs has different type throttle plates and governor arms for the opposed twins is why I ask about pictures of yours.

Also post up close up pictures of yours throttle plate when at idle and also a full throttle.

I had the original carb on it when I first got it running but put another carb on
CHINA
I will take a look at it tomorrow I cleaned up the original carb to put back on i don't know if it is actually the right carb??
Anyway i will get some pics!
I do have another Briggs carburetor looks like it could work it is from a twin engine pretty sure it was an opposed twin!
It has #s on it so I should look and see if it will work on my engine!
I keep posting this
The engine runs wild with no springs or tension on governor
And I thought that would mean it is not functioning???
Should come to idle??
Thanks for more info and I will report!

 

[Forest#2]

You mentioned changing the carb. Not likely the carb with the symptoms you said.
Them Briggs twins only used two types of carbs a 3 screw and a 4 screw and this referred to the fuel pump on the front of the carb. Kit for the carb same for both, just had to get correct kit for the fuel pump. Not likely it's a carb issue because you say you changed carb's and symptoms same. Them carbs usually very reliable except the pump can become erratic from not being used and ethanol gas. Make sure the little dog leg linkage swivel connection behind the carb is allowing the linkages to swivel freely for the carb throttle plate carb shaft control.

My point being:
At first You are going to have to get the engine to idle slow without the governor control. You will never get governor speed control if the engine cannot be slow idled without the governor.
The first test is making sure it idles holding the carb shaft at idle against the idle set screw while the engine is running. This test is confirming that the throttle butterfly in the carb throat is closing or you do not have a bad air leak causing a high rpm and neither one is likely. (but this needs to be confirmed first)

Next is seeing that the on dash throttle lever brings the engine to idle with the engine not running. This can be see by watching the carb shaft going to or towards idle. (Without the governor arm even connected, just leave the governor arm completely loose on the shaft)

I suspect your engine speed issue is with the mechanical operation of the throttle plate not allowing lower rpm idle operation and the spring loaded governor lever arm cannot over ride such trying to slow the engine speed.

 

[bentrim]

If you can control the speed by moving the carb lever to touch the idle speed screw, you don't have a carb problem.
When starting and operating the engine the external governor arm should move the carburetor to idle and you will have to overcome the governor force to speed up the engine if the governor is functioning and adjusted properly. If you have no force trying to close the carb lever and moving the governor arm closed there are two choices, the governor gear is not turning or the governor is not adjusted properly.
By you video it appears as if the governor is turning as I see you have tested it with a wire and it was engaged to the cam gear, just as the case was closed.
Not trying to be a smart axx but just trying to help a fellow mechanic to overcome an aggitating issue. Wish you were next door I would gladly come over and see if we couldn't get it right.

 

[McTurff]

If you can control the speed by moving the carb lever to touch the idle speed screw, you don't have a carb problem.
When starting and operating the engine the external governor arm should move the carburetor to idle and you will have to overcome the governor force to speed up the engine if the governor is functioning and adjusted properly. If you have no force trying to close the carb lever and moving the governor arm closed there are two choices, the governor gear is not turning or the governor is not adjusted properly.
By you video it appears as if the governor is turning as I see you have tested it with a wire and it was engaged to the cam gear, just as the case was closed.
Not trying to be a smart axx but just trying to help a fellow mechanic to overcome an aggitating issue. Wish you were next door I would gladly come over and see if we couldn't get it right.

I'm trying to take all this info and apply it!
Yes wish I had a pair of knowlegable eyes to see what's up with this engine!
I think this is a good engine if I can figure it out!
I'll keep plugging at it!