Okay so I am in the process of replacing a broken rave valve on my 97 XP. I had the motor rebuilt in 2004 using a Wisco top end kit at a jet ski shop. I know I have to shave a bit of the rave valve if I have gone oversize by more than .25mm. I have contacted the store but they don't keep records that far back so how can I tell without taking the motor apart if it has oversize pistons or not?

Or should I just shave .25mm off or so to be save? I have got the broken valve I could get the measurements off that and get the new rave valve cut to the same size I guess?