Hi MF,
My experience with these Chondas is that its nearly always carburetor problems. I think you can get cheap carbys on the internet but I have never needed too. In my case its either rust from the bottom of the bowl getting stuck under the needle valve or a blocked main jet. I have always been able to clean them out OK but if not I would get an internet carby. Once I had clean the main jet with some fine wire but It worked well.
The other thing is the choke. They will not go if the choke is not absolutely completely on. It can be adjusted on the linkages but on one of mine I am using a rubber band to pull the choke right on for start. Starts first pull if you do that but will not go at all without it.
Other than that they seem to be fine.Even the kids can start it.
I wouldn't waste a Powertorque on those bargain basement models. One PTs will be worth a fortune.
All the best
Jeff