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I think i've blown a hole in one of my standard pistons, 125-130 psi in cyl 1,3 & 4 on compression test but a big fat 0 in number 2. Its blowing straight into the crankcase side of the engine so i'm pressuming its a hole in the piston.
If i'm going to have to put new pistons in then i'd prefer to buy uprated items for peace of mind