aight...so i had a similar problem before. my RPM's would shoot up really crazy and the bike wouldnt go anywhere...and it did this at lower RPM's. Now, when i really gun the bike, it does it at higher RPM's.

Before, it turned out to be the clutch cable needed to be adjusted looser. so we did. the cable at the lever is as loose as it will go, and now im still having this problem. could this be a warn plate or is there another way to adjust the cable? The lever feels a lot tighter than it was when we adjusted it the last time.