Sorry mate - does sound a lot like it nipped up (seized.) not at all familiar with the engine arrangements on scooters but can you not just drop the exhaust off and stick a flashlight down the exhaust ports?
Top end rebuilds are a doddle on 2 strokes and usually pretty cheap. I wouldn't ride it any more until I'd checked it though....
Sorry mate - does sound a lot like it nipped up (seized.) not at all familiar with the engine arrangements on scooters but can you not just drop the exhaust off and stick a flashlight down the exhaust ports?
Top end rebuilds are a doddle on 2 strokes and usually pretty cheap. I wouldn't ride it any more until I'd checked it though....