YZF1000/FZR1000 Pistons the same?

[Russ]

Hi
Are these parts the same. Part numbers are different but I was under the impression they are the same. WISECO & JE list them as being the same although Yamaha don't!! What do you think?
Cheers

[DonTZ125]

Interesting. The piston and wrist pins have different part numbers, but the piston rings, snap rings and con rods use the same part numbers. The differences can't be THAT great ...

[Russ]

It is an odd one. I spoke with Yamaha, and whilst they can't tell me what the difference is, they did say that if part numbers are different than it must me different in some way (lol fairly onvious statement to make but true enough).

I'm not going to chance it.