Re: Mercury 6hp with a 8hp carb?
Back in those days yhey all used the same carb, with differant jetting same block, pistons, rods and crank, all engines had the same compression ratio, differant years used differant model carbs but the same venturi size. The 6 and 8 HP had no tuning pipe, the 9.9 HP had a 1" ID tube and the 15 HP was larger with a larger carb.