Ruima is also for the scooters over 100cc :/
Seems like the big guys get all the fun, and we get to stick with the cheap stuff. :p
If you look at the world market, the 50cc population is very small. In our small country alone with 4 million registered (small) motorcycles and scooters, you can rarely see a 50cc. And if ever you see one, they'll be the old 2-stroke Dios and Jogs. The smallest underbone bike is 100cc. Same with Vietnam, Thailand, Malaysia, etc. So, it also follows that after market performance parts for the 50cc would be scarce.
Trivia: Vietnam is more or less the same size as New Mexico (USA) and has a total motorcycle population of more than 20 million....