Welcome to the wonderful world of Evolution engine limiters!

This is the "walking needles" problem I've often referred to in other posts.

What you need to do is the following.

- Loosen the "grub" screw on the blue limiter collar fully, then pull the collar straight up and off the needles.

- Pull off the "clips" ( which look like inverted pen pocket retainers ), and bend the clip itself towards the circular retainer, to apply more tension.

- Remove both needles completely.

- Clean the needles of ALL fuel. Get them dry.

- Clean the receptacles for the needles of all fuel, get them dry and clean as well. Make sure you leave NO debris or lint inside.

- Using a microdrop applicator, place an ever so TINY amount of thread locker blue on the threads of the needles and turn them in to the defaults.

- Put the clips back on, now hopefully much tighter...

- Start your plane, tune it up, perform a nose up and down test to check your settings. Get it tuned perfectly on the ground.

- Now if you wish, re-insert the blue collars, with the pin at the center of the adjustment arc.

This will set a new adjustment limiter range for quicky tuneups.

The clips and the thread lock will prevent the needles from walking.

You can also place a bit of cut up exhaust deflector tubing over the needles to press the clips against the detents.

I've used the latter at the field as a quick on site repair to the "walking needle" problem...