I do evrything else myself but the mills kinda IDK scare me. I dont have a air compressor to clean it out when putting it back together which is 1 thing I would have to do. The most I do is take the head off to clean under it and around the plug hole. Sooner or later I will start messing around with them but with an old 1 not a good one. I do of course seal my backplates and carb necks. And you aint telling me nothing aboutbreak in this was the toughest ever for me I had to heat it up for almost the 1st 3/4 gallon and still has mechanical pinch and it is a monster I ran it in truggy 1st and still was way powerful I had to tone it down for buggy.