It feels like my clutch is slipping on my Peugeot 103sp. The moped runs fine, then starts slipping at high RPMs. Eventually, it will hardly even catch. But if I let off the gas for a little bit, and let the engine RPMs settle down, it will catch again- but soon start slipping again. When the moped is not hot yet- it runs fine. It seems only when the engine gets hot the clutch starts slipping. Do I need new pads? They might be worn down?