OK, so I finally got AND installed my new 6 gr rollers instead of the 7 gr originals. Remember, my dealer unrestricted my CDI. First thing, right off the line, I noticed higher revs before the clutch engages. Right after, I notice more willingness in the acceleration. A few seconds later, I live in the middle of a steep hill, I was reading 36-37 kmh where it used to read 30-31 kmh. So, up to now, much of the desired result is attained.
After that, I go riding on flat ground. Acceleration seems greatly improved with the revs seemingly much higher. After a while, I notice it gets much faster to 60 kmh, but then, acceleration tapers off to about the same as it was before but I still reach the same top end of about 68-69 kmh. I guess this is the most I can get out of the little engine while maintaining it stock. Remember, its a 50 cc 4 stoke and I weigh about 200 pounds. My wife, on the other hand, noticed more of an improvement, with about 50 or so pounds less. She find acceleration brisk and hill climbing adequate to the point of not slowing trafic down. She says she manages to keep at least 55 kmh going up hill where I, the fatso, only can only muster a miserly 35-40 kmh. So I guess I reached what I was aiming for, better acceleration and acceptable hill climbing ability for my wife so riding is safe in urban trafic.
I guess more power is somewhat possible, but seems more difficult. I'm thinking of changing the jet so I can get more air through the carburetor...but more work. We'll see...