Choice of pistons
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@Ricky Yo.
Wiesco make excellent pistons for the MX market 2strokes. Mitaka is good too, maybe not highly regarded for racing pistons, but a very good replacement to run in a DT125,
it's not a highly stressed engine by design so I wouldn't worry about a Forged piston unless you really want to.
You have to remember that a forged piston takes longer to expand in a heat cycle, so in theory you can begin to wear the bore somewhat if you don't always get the engine to a higher temperature.
A minimal consideration?