Broken choke (bystarter) valve nuts

Two out of four choke (bystarter) valve nuts agree, breaking in half is where it’s at.

Broken and unbroken
Broken and unbroken choke (bystarter) valve nuts.

The first step in replacing the choke valves is removing the shaft, and the first step to remove the shaft is loosening the screws.

Choke shaft screws loosed
Choke shaft screws loosed

Once the screws are out you can slide the shaft out to one side. The choke arms will get bound up as the shaft slides out so you may have to jiggle them a bit. Also, there’s a spring so be careful not to lose that.

Choke shaft extraction
Choke shaft extraction

Next remove the choke arms from the choke valves. Try to keep them in order, one of them especially has to be reinstalled in the same location.

Choke arm
Choke arm

Well there’s your problem lady. Let’s get that out of there.

Broken choke nut
Broken choke nut

The new choke nut and a broken one side-by-side, there’s a bit missing that’s still in the carburetors.

Side-by-side, new and broken choke nuts
Side-by-side, new and broken choke nuts

The spring can just be pulled out at this point but the choke valve itself is still held in by what’s left of the nut.

Choke valve spring
Choke valve spring

To get the rest of the valve nut out of the carburetor I used a pick to chip out a notch in the barrel of the nut then forced it around counter-clockwise to work it out of the shaft.

Broken choke valve nut extraction
Broken choke valve nut extraction

The new choke valve assembly laid out and ready for installation.

New choke valve assembly
New choke valve assembly

The new choke valve with unbroken nut installed and ready for the shaft.

New choke valve and nut installed
New choke valve and nut installed

Reinstall the choke arms and slide the shaft back in from the side. Don’t forget to reinstall that spring you lost earlier.

Choke shaft spring
Choke shaft spring

Once the shaft is fully reinserted, reinstall the screws and tighten them down.

Choke shaft reinstalled
Choke shaft reinstalled

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