Minarelli stock piston?

I just broke one of the two rings on my stock V1 piston and I was wondering what the proper replacement size would be? also does anyone have any advice on the right method for putting the piston back in the cylinder, Thanks for any help.

Re: Minarelli stock piston?

38.8mm for the roller-bearing V1.

I was taught to put the piston to BDC and then slowly slide the piston into the cylinder.

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