I just rebuilt a PX125 engine
All bearings except clutch crank bearing were replaced.
All seals were replaced.
New clutch discs,
oversized piston & cylinder. (new piston)
the gudgeon pin bearing was not replaced.
crank was not replaced.
But it makes some whistling noise..that I feel not normal..
Someone told me that the con rod could have a problem.. So I just attache a video piston working..
Does anyone know what happened to it?
I already split this engine twice.... hope no more split it again.. lol