I have a new never run Evolution .46NT in my plane I read in a post that these engines need to have there limiters removed. This is my first engine I have no idea what to do according to the manual these limiters keep you from adjusting the needles outside the engines ranges. Can someone send me photos on how to do this or can I leave it as is, the engine needs to be broken-in.

Most of the recent Evolution engines my club members have been using have been within the needle adjustment range, so unless you're having trouble tuning the engine, leave the limiters in place.

Should you need to remove them, a pair of needle nose plier works great. Just pull them out.

Brad

Pull what out? Are you talking about the little *** on the high speed needle valve.

No, wzak. There is a gizmo on the needle valve assembly that restricts rotation of the needle valve to about, oh, 130 degrees or so to help prevent either over-lean or over-rich operation. Supposed to help new owners in adjustment of the mixture. Most just remove it to have more rotation range of the needle valve.

CGr.

the low speed or the high speed needle valve?

I think both have the limiter. It's a little tab that sticks out of the needle valve that is between a pair of posts. The posts are the limiters, if my memory serves me correctly.

As bkdavy said, If the engine runs good, leave everything alone.

IF it does not run right, you can pull that pin out of the high speed needle and/or remove the pin from the blue collar around the low end adjustment.

For the break in leave the limiter in place...Doesn't evo say no break in required?......as a new owner it will ensure that you don't run the engine too lean.
However the evo engines I've tuned just can't seem to get tuned with the limiters in place. after break in what you do is (hgh end) lean out the engine to max RPM by sound.....more lean and RPM drops, richen and RPM drops...this is peak...now richen 1/8 to 1/4 turn...this is where you want to be as the engine will lean out in the air.....
the best thing to do is get wit an experienced flier to help you..not only about the tunning, but everything RC

Just for the record - I reviewed the EVO TPS a few years ago and mine would not run right. I called the manufacturer and was told that several of them got through QA with the wrong low-end needle setting.

The PROPER low-end setting should be as follows:


Remove the blue collar from the low-end adjustment.

Open the carb 1mm

Close the low-end needle

Open the low-end needle 1 1/5 (one and one fifth) turns

Replace the collar.

The Evolution engines aren't totally broken in, just pre-run. As the engine breaks in over time, the settings will change a little, and that may (or may not) require changes to the low end mixture beyond the range of the limiter. The high speed needle will also sometimes need to be adjusted outside the range allowed by the limiter on it.

Like the other guys have said, I don't disable the limiter on my student's planes unless I have to to get the engine running right.

However, I have seen a couple where the low speed mixture would drift a bit in flight, and one PTS Mustang where the pin sticking out of the low speed limiter would hit the cowl, resulting in the low speed mixture changing in flight. In those cases just removing the collar entirely fixes the problem. I think the problem is caused by vibration working on the mass of the limiting collar, causing it to move a bit.