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I took out the plastic filter cover to the CVT and left it open. I was thinking about drilling holes in the cover.

I adjusted the valves first when I started having this problem with the hesitation. I thought that may be the case. Usually, when my valves go out of adjustment I have a hard time starting the scooter and my gas mileage drops. I monitor my mpg at every fill up (I have an app for that). Still getting 68mpg with my hard driving.

Drove it hard today. Took a lot longer before I started having hesitation issues. But not like the original. I am also getting a sudden stall and a backfire. A few things I noticed today was the my rpms seem higher than before. This is done by sound. I wish I had a tachometer. I think a tach would help greatly. I also use to have a (do not know how to explain) warble sound when running a constant speed. That went away but I do notice a different high rev sound. The more I think about this, the belt may be sticking or slipping as the CVT heats up. Without a tach it is hard to tell. Here's my theory. As I go from stop the belt may slip slightly and then when it grabs completely or partially the engine sputters. The rollers may have a slight transition in direction which may cause the variator to open and close ever so slightly and then I get this jerky action which may stall the engine. Just a theory.
It is hard to tell if the contra spring has made a difference. The engine/CVT combination really improved since yesterdays little tune up.
I work the next three days so no tinkering on the scooter. Just driving conservatively to get me to and from work. Maybe I should request some OT for new parts.

I took apart the CVT again yesterday after this posting. The clutch housing does not show any blue coloring. The internal surface is very polished looking. The clutch pads smooth looking. The belt is a Bando 835 standard size.

Here is what I did. Replaced contra spring with 1500 rpm. The original seems to be the same tension. However, it is shorter than the 1500. Did not change clutch springs. Looks to difficult w/o proper tools. Roughed up the clutch pads w/sandpaper. Changed belt from other scooter. It is an old belt but I thought that I would give it a try. I took the variator off and polished the roller races with Mothers aluminum polish. I also polished the risers where the "V" clips slide. The risers did have vertical scratch marks and felt as if the "V" clips may stick as they slide up and down the risers. I did not want to mess with the surface of the variator. I do not want to introduce any new issues if I may the surface too slick to cause belt slippage. Cleaned rollers with rag. Put everything back together and went out for a short 1/2 ride to the store and back. No problems. Today, I will try to "push it" a little harder to see what happens.
Oh, BTW I have not noticed any slipping.
I will be ordering a new variator and sliders as well as a belt in the near future. Too many once a year expenses this month.

Thanks for all the insight.

Nice looking scoot. Be safe. Most of all have fun!!!

Update: Drove the scooter around with the CVT cover off. When the scooter stalled the belt was in the center of the variator and at the top on the clutch, ruling out a stuck roller or variator issue. Changed the fuel filter. No change. Changed out the carb.

valentino2003 may have the solution. The carburetor swap seems to be the fix so far. Drove around tonight w/o any issues after getting the idle set. Going to take apart the carb later in the week and clean it.

FYI my original scooter purchase is a "Milan" style no name Znen import. The salvaged scooter is a Lance. The Lance carburetor appears to be larger than my original. I have been running with the Lance model since I swapped engines due to a broken exhaust/swingarm mount on the flywheel plate.

I feel sorry for anyone that purchases these scooters w/o any technical abilities. I have had many issues with this scooter.

Went out for a test drive today. When the scooter is cold it runs great. However, after it heats up it stalls when starting from a stop. I guess I am going to have go for a test drive with the cover off my CVT housing to see if the belt is actually stuck in the variator. Going to order a new variator this week. It may be a combination of rollers and the "V-Sliders" sticking as the variator heats up. Is this a common problem?

Oh, I have a question. Is it normal for the CVT cover to get so hot that it can not be handled after driving the scooter?
Thanks

ootscoot, I read your message last night b4 going to bed and it makes some sense to me. If it is truly a fuel starvation issue, I would see hesitation at WOT. The other thought is that it seems like I am starting in 2nd gear well b4 this stalling issue arose. That leads me to believe that I may have had a stuck roller for some time now. After I did my engine upgrade I had more response off the line and that slowly went away. I have been considering a variator upgrade but have been putting it off. My stock configuration has 17g rollers and I was thinking about 13g or 15g slider style upgrade. I do not want to go too light and over rev my engine.
Thanks for the insight.
Ed