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  1. Off-Road / Enduro
    When should the piston and rings be replaced on a 250 EXC 2T (2006)? I have now done ~90 hrs and I am thinking of giving her a new piston and a set of rings. However looking up the exhaust port at the piston it looks like new! I use rock oil synthesis 2 fully sythetic oil at 125ml per 1L of...