Reply To: Piston rings for MK25

[Charles Byron]

I just checked the bores. I don’t have a dial bore gage so I had to use a snap gage and a mike. I got 2.439 pretty much everywhere I checked. Now my technique probably isn’t 100 percent accurate but I think it’s close enough for a home workshop. Once I hone them maybe 1 or 2 thousandths more. I’m guessing that’s OK. The Mercury service manual says the bore is 2 and 7 sixteenths. I believe that works out to be 2.435 so I think I’m in the ballpark. And I guess 10 thousandths gap is what I need…Charlie