Mercury - 250R Rear Decal Mercury Racing Series High-Bond Marine Vinyl 8M0143774. Overview. There is a certain pride that comes with running a Mercury Racing engine. You feel it every time you throttle up and the boat settles into that smooth, hungry surge only a 250R can deliver. The look of the engine matters just as much as the performance. When the rear decal starts to fade or peel, it dulls the personality of a motor built to stand out. The Mercury 8M0143774 250R Rear Decal restores that bo