So if anyone is interested YSR 50 wiseco pistons can be made to work on 103 bore. I'm using one in a Malossi LC 50cc engine without issues so far, it does take relocating the pins, drilling holes in the piston to cool the exhaust bridge and lathing down crown. Shown on the right is the old piston that unfortunately went into detonation, oddly enough this was after 8 to 9 months of riding the bike around, guess I finally managed to get the right combination of events and pop!
Peugeot 103 pistons
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