Stihl 028 choke tightening modification.

[Chainsaw Jim]

I was thinking about how to tighten up a choke lever spring that was in no way worn or out of shape. It had a little slack from a slight mismatch in size between the loop on the spring and the cotter pin. I have spare weed trimmer carbs I keep on hand for scrap parts and noticed the fuel line barb is the ideal size for this.
I cut the barb down to size and assembled the choke system with it in place to take up all the slack and add a little more tension... without any risk of damaging the spring or introducing a part that may later come loose.
I used a flat sanding board to clean it up to size at 3.75mm long

 

[Chainsaw Jim]

I also found that the lever part can be filed down to allow some more flow without compromising the function of the choke.

The plastic back plate under the lever also needs a little relief to let it open even farther.

 

[Duane(Pa)]

Nice work. I have had good success nipping a few coils off the spring, then re-forming a hook. I use a piece of monofilament fishing line to pull it over the latch pin.