HS4 carb rebuild question

[ADRay]

I have my carb apart, and have the opportunity to have it machine cleaned, but I'm curious about this little plastic-looking plug on the bottom of this piece. Rebuild kit didn't come with a new one, and it doesn't look like it will come out without damage.

Does this stay in place? Thanks

[MPlayle]

Yes, it stays in place.  I do not know its purpose, but it looks to be similar to a grub screw plugging a milling hole.

[ADRay]

Thanks, I'll leave it alone.

[ADRay]

As I continue to rebuild and install my carb, I am having a problem with the choke return spring. I can get it wound up and get the whole linkage back together, and it will still pop loose. I'm reusing the old linkage and springs (in good shape) but have converted the jet to standard, using the conversion kit wire.

Sorry I don't have a pic, after the last time it popped loose I left it on the bench and walked away for the day.

any suggestions?

[John Gervais]

I think that plastic buttony thing is a 'bumper' which prevents the piston from slamming too hard onto the bridge.