Engine size help

[Kezzaj666]

Hi everyone
I need some help please i was just given a dhz bike and need to get a new piston etc but im not sure what size the engine is
Numbers are 1P60YMJ

Cheers in advance

Kezz

 

[xLOCOx]

Hey mate, the motor you have is a zongshen 160
160ho
Usually, a 60mm piston with a 13mm gudgeon
But if it has a bbk it'll be TB 64mm piston