MY 03 CR 250 WHILE IN THE POWER BAND IS HARD TO SHIFT OR GET INTO A HIGHER GEAR UNDER HARD ACCELRATION. SHOULD I GO TO AN AFTERMARKET CLUTCH OR HOW CAN I FIX THIS PROBLEM. TRIED ADJUSTING THE CLUTCH BUT DID NOT HELP, ANYONE ELSE HAD THIS PROBLEM, AND WHAT WILL CORRECT IT.