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Engine on a Husqvarna 46in riding lawn mower. After replacing the carburetor I have had issues with surging and idle. The replacement is not an exact model but very close. Initially, the engine would constantly surge when not under load. It also didn't seem to run fast enough. I reset the governor and now it idles way to fast - no surging. I have double checked the governor linkage - shaft fully rotated clockwise, arm fully extended, throttle wide open. The problem is that the throttle (butterfly) never returns to the idle position (against the low idle screw). There are 3 springs pulling the throttle open, including those attached to the governor. (Can we pause a moment and contemplate the insanity of this. Why do these engines have a primary and two backup springs designed to pull the throttle full open {blow up}?).

I have completely disconnected the throttle cable. I can pull the butterfly closed manually and the engine will idle just great. As soon as I stop pulling the butterfly closed, the engine goes to almost full throttle. I turn the key off at that point.

The carburetor did come with a different butterfly linkage rod, but I tried that and the original, but still have the same problem.

Are there specs for the throttle butterfly static position (no throttle cable attached, engine off)? Are there specs on the amount of spring tension pulling the throttle open at the static position?

Any suggestions on what might be wrong?

TIA

Refer to the actual Briggs and Stratton service information might be a start.

You've added an aftermarket carburetor, played with the governor which should never be done for any kind of idle issue.

The governor only has one job and that is to limit the top engine running speed at a safe level of 3600 RPM.

Maybe this will help:

Auto Doc's said:

Refer to the actual Briggs and Stratton service information might be a start.

You've added an aftermarket carburetor, played with the governor which should never be done for any kind of idle issue.

The governor only has one job and that is to limit the top engine running speed at a safe level of 3600 RPM.

Maybe this will help:

Briggs INTEK 22 Model 44N877-005G1service manual - Search Videos

Watch videos instantly on Bing—enjoy direct playback, discover related clips, and dive into trending content all in one place.

www.bing.com

Click to expand...

Do you have a source for the Service Information? Briggs only has operator and parts list manuals on their website. The governor was adjusted to address a surge issue at operator throttle and not an idle issue.

I have quite a number of repair book and CD's I purchased on Ebay. Search there for Briggs and Stratton Service manuals

In reality, the manuals give mostly general and not always specific information.

Read next post I was editing the manual number when startech replied.
Service manual for that engine is Briggs 273521. (around $30)
Well worth the price if you want to do work on the engine yourself.
It has carb, governor adjustment procedures.

Forest#2 said:

Service manual for that engine is Briggs 272144.

It has adjustment procedures.

Click to expand...

The OP said it is an Intek not a Vanguard engine so that is the wrong service manual. It would be Briggs 273521 manual.

That engine should has only 3 springs, a main governor, governed idle, and a choke return springs. Sound someone has installed an extra spring.

Also with governed idle the engine will not fully return to the idle stop. The idle adjustment screw to set the bare minimum idle and governed idle spring pull it off to set a governed idle speed. Bare minimum should at 1200 rpm and governed idle at 1750 rpm. This requires the use of tachometer to set it. If you set bare at governed idle speed the engine will tend to go racing to max governed speed.

I wanted to bring everyone up to date on this issue. After searching The Tubes I found a mechanic that discovered a similar issue. It seems that when my motor over-revved (although very briefly) the centrifugal governor mechanism flew appart inside the engine. Now the only mechanism from keeping the motor from self-destructing has self-destructed. I will be pulling the motor and replacing the broken governor.

Thanks for the responses.

When you initially reset the governor adjustment, it likely had enough room to allow the governor center pin to pop up out of place.

Hopefully it is a simple fix and a new gasket, and you are back up and running. Note: Use only a Briggs and Stratton sump gasket kit. Amazon gaskets will create problems.

Auto Doc's said:

Hopefully it is a simple fix and a new gasket, and you are back up and running. Note: Use only a Briggs and Stratton sump gasket kit. Amazon gaskets will create problems.

Click to expand...

Not necessarily. I had two of the Briggs gaskets to blow out on the same engine [I mean within a week] and I got 8 of the aftermarket ones off eBay and it been over two years and it is still holding. The Briggs sent was like vanilla file folder paper and felt flimsy. When the Briggs ones blew they looked like expanded metal.
The eBay ones actually felt like good gasket paper. They even came with new lower seals.

Hi StarTech,

I also had a couple fail years back because they were too thin, but the last one I got was a thicker and improved design.