New style of 66cc engine:To port or not to port

Hello everyone,
This is my first post.
Some background on myself in regards to motorized bicycles is that I have already built on 66cc motorized bike. It was pretty junkie bike but I really enjoyed working on it. Also I got it going about 27mph with all stock on 24" wheels. It became so reliable that I used it as my commuter to college every day!
Long story short it got stolen last January but now I am going to build a better and faster bike to use once this Midwest snow melts. (Pic of my old bike:blue bike with motor.)

To my point:
I received this 66cc engine off of amazon from the same seller as my last engine and first off you'll notice there are no header/jug bolts. The head and the jug are one piece with 4 hex heads at the bottom of the jug to connect to the lower part of the motor. Has anyone else seen this style engine before?
Also the ports seem pretty clean and smooth, not perfect.

I have two questions:
What are your thoughts on this motor?
Do these ports need porting??

Hopefully I get some responses.
Thanks guys!

Greg58 said:

That is like most chain saws and string trimmers are designed today, one advantage is no head gasket to leak. I wouldn't do much till I ran it other than cleaning up the rough spots if there are any. The disadvantage is if the squish band is not correct you are stuck with it, you can't upgrade to a after market head to improve Cooling and compression either.

Click to expand...

Thank you for the response Greg58

I decided to take off the jug(if I am using incorrect terminology please tell me) look inside.

What I believe I should do is bevel the edges of the intake and exhaust ports.
Also what are those ridges in the middle of the transfer ports??
Can I remove them to allow better flow?

The engine works well and with all stock parts from the kit I am able to hit 34MPH flat out on an aluminum mountain bike frame. The only down side I have seen of this motor is it is balanced quite roughly in my opinion. It runs smooth until you hit 10MPH and then vibrates quite badly from there and faster.

I will be re balancing the crankshaft here soon.