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  1. J

    Mercury 150 xr4 will only go 10mph full throttle

    Have a mercury 150 xr4. I believe it is a 1988. The motor starts really well and will rev all the way up in neutral. Will also work really well when hooked to does ears. When it is actions in the water and in gear, full Flored it only goes 7-8 mph. It appears that only when it's under load that...
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