I have a 97 banshee. It will not rev up all the way with or without a load. I have changed plugs, I had carbs cleaned, I replaced the coil, I installed the new vforce 4 reeds and still having the issue it cranks and idles fine. But when you get into the powerband it just breaks down. I have played around with air/fuel mixture no real improvement I don't know much about 2 strokes so any thoughts or suggestions would be appreciated