Thanks Guys..I have removed exhaust and reached in exhaust port...no up & down play at piston so would think big and small ends ok..slide sideways rotational movement but suspect normal..however powervalve has play in it and can be rattled about...hopefully this is what causes noise and nothing to w...

I have jsut bought a CRM250, first 2 stroke I have owned since a kid many years ago. Great fun bike however I have a slight concern reference an engine noise. The engine was apparently rebuilt approx 1000 kms ago and bottom end + gearbox seems quite, sounds mechanically quite when reved but fairly l...