Does the "First Oversize Piston" mean you have to bore the cylinder? - Page 2

 

The easiest way to get a good answer to your question is to check the
chart for piston sizes.

If the "first oversize" piston is 1/4 mm, then it will require a
cylinder bore, or bore and re-coat of the bore to accommodate the
piston.
If the "first oversize" piston is .01mm, then it is like the B, C, & D
oversize pistons that companies such as GasGas use. These pistons are
"oversized" very slightly, to help the piston run true in the bore,
and all sizes use the exact same specification rings. No boring
required.

FYI:
Kawasaki dirt bikes have been using a nikasil type bore coating since
the early 1980s.  (At least, the '83 KX125 that I set up and
maintained for my son, Josh, had a nikasil cylinder bore coating.

Good Riding and Wrenching!

Jim

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         Wudsracer/Jim Cook
          Smackover Racing
         '06 Gas Gas DE300
        '82 Husqvarna XC250
           Team LAGNAF