I have a lil problem wit the transmission, whenever i put it in 3rd gear (and 5th), the transmission makes a strange noise...i`ve talked to some people and they say that it`s a bit broken, but it`ll work. The thing is..i don`t want it to work that way, i want to replace it. I`ve heard that i can fit in a suzuki dr200 transmission onto my Qingqi200GY.
Do i have to replace the whole transmission or there is an option to change separate gears?
and the last and most important...how expensive will it be?

ps. another thing...where can i order some plastic parts for my bike? I`m from Macedonia and it`s impossible to find them here as far as i know.
Thanks