One note on those limiters and grub screws.

The first time I tried to remove the blue collar I had a hell of a time.

The ( idiot ) at the factory had screwed in the grub screw so much that it deformed the metal of the needle valve.

So even with the grub screw fully off the raised metal was preventing the collar from coming off.

I had to use a gear puller to remove it.... but it was a PITA to start, because the collar sits so close to the bottom of the needle valve.

I wish they left these things off, maybe supplying them in the box, and advising the novices to let an experienced engine tuner, first set their engines, and then install the limiter for the novice, to get things right.