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  1. High Compression pistons Pro's/Con's

    Honda FourTrax
    I am needing to bore my cylinder probally .040 and as i was looking at pistons Stock is 8.5:1 and i seen a 9.5:1 and a 10.5:1. has anyone ever had any problems going 9.5:1? i hear that 10.5:1 is very hard on the engine and i would like the extra HP!! but i want it to be a rider and not a...
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