I had that exact same engine.

When "dry" the compression felt very low but if i added just enough after run oil to line the cylinder walls the compression improved dramatically.

I read a post here recently which stated something about enya's using the oil in the fuel to aid with compression.

BTW, don't forget the carb has 3 adjustments. There is an air bleed which is used to adjust the idle. I was forever chasing needle settings because the airbleed was rich from the factory which tricked me into setting the low needle too lean for a good idle. The result was poor transition in the midrange and back to idle.

Once i realised my mistake and leaned the airbleed slightly it was a great little engine. It is the lightest .46 made. Several oz less than a typical OS 46ax which makies it a great choice if your model is nose heavy.