Need Porting Advice

I don't think that's a 2 stroke. It looks like an old European bike or something....
Regardless, ading to port volume will kill the small amount of torque it makes IMO and it's got a huge issue with fuel coming out of suspension looking at the top of the block. So it's already got weak low speed signal.

You're right, I just glanced and it looked like a bike motor, therfore I just assumed and completely missed the valves.=my duh.

But I still keep the same thoughts on this, leave it or...experiment with some minor relieving but in a way leaves that turbulent mixing so it's not fouling plugs at idle,low speed.

And that idea comes from the look of the burn color/travel.

I would be asking this question on a forum with experienced members in the area of messing with these particular engine's, that is If I expected to get the best advice and results.