250cc Modified Runabout (250ccMR), Also known as "A Mod" or AMRDisplacement: Starting at 12.5 cubic inches up to 15 cubic inches. Mark20H (20 cubic inch Mercury engine with 1987 Stock Outboard specifications). RequirementsMinimum Age: 14 years oldEngine: Swanson/Champion or American Hot Rod,"A" Mercury KG4H and Mark 15, or "converted" Mark20H Speed: 60 - 65 MPHMinimum Weight: unknown
