They are exactly the same engines.
One was easy and the other not so easy.
I'm going to a friends who has a gear puller and give it a try.

I'll keep you up dated.

By the way I just picked up an Echo CS-300 Echo chain saw engine
as a basket case. It cleaned up real nice.
Ordered the ring today it's suppose to be in on Tuesday.
I'll probally put it on my Birdi Old Timer, if I ever finnish it.

Anyway it's a 30cc reed valve engine rated at 10,000 to 12,000 rpm.
It should Haul the Mail as they say.

It took about 2 hours to get it ready.
Now I need a prop hub, I already have the Gas-Glow mixture ready.