09 yz450

I would like to ask you all what is the best rebuild kit? I want reliability not performance thanks in advance

I would like to ask you all what is the best rebuild kit? I want reliability not performance thanks in advance

Unless you have over 300 hrs on it save your money!

No the rod came apart and took the cases out also. I have new ones I just need to know if cast or forged piston

There are no cast pistons for the YZ450 that I'm aware of, including the OEM.  IMO, OEM parts for that engine are as good or better than any other normal rebuild parts, and often less expensive.

What is imo parts

There's no such thing. "IMO" is an acronym for "In My Opinion".   It's often "IMHO" for In "My Humble Opinion", but humility is not one of my virtues, really. :excuseme:

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