i have a question,

i have Wiseco Pistons and i need rings for it. what kin of ring do i need?

Pistons code is 6626M855, 29020

thanks you in advance,

should i change rings on all pistons or only that which i broken?

 

You have to contact Wiseco. The rings are not built to the OEM specs, they are built to Wiseco's specs. They will supply rings.
How did they break? Was it installation? If so, replace only what's broken.
Detonation?, then yes, all pistons, rings and lands need to be inspected, might as well replace them.

 

thanks i see