HOW TO UPGRADE A SYM RV PISTON FROM A250CC TO A SYM 300CC
In this video I'm going to show you how I'm gonna change my Sy Mr V-2 50 CC from a 250 to a 300 CC using Sy M parts I take it all apart and replace it with the piston and the valve of a 300 CC hopefully this will work and give us more power and speed please like and subscribe thank you for watching and enjoy

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