I bought a Rieju RS3 50 brand-new (I'm a young rider, it's the biggest displacement bike I could get), and I seem to have quite a few problems with the gearbox. The first problem is that there is just lots of clunking noise when going between gears, and not only when going from neutral to first gear. Another thing is, sometimes you need lots amounts of force on the shift lever to shift and sometimes you need little force, it's very unpredictable basically. The biggest problem I noticed happens whenever going to a stop. I shift to first gear, clutch-in, and I come to stop, and what happens is that I can't raise the shift lever to go into neutral - it's stuck! The fix for this is very random - sometimes just turning off the engine and starting it again fixes it, but sometimes I need to drive a little in first gear before I can shift into neutral. The neutral gear is very jumpy in general, you sometimes need to be extremely gentle when shifting, or it will shift into second, and sometimes it's fairly easy to shift into neutral. The last problem I noticed (although I'm not sure if it's even a problem) is that when riding, the revs just quickly rose up for a brief moment, as if I pressed the clutch and throttled the engine. This has happened two times. I'm not sure what to think of this, is this even normal? What do you think?