I when yesterday so ill check the plug iv all ways been told to run my outboards 50:1 mixs so i had 24l of fuel and 480ml of oil as that what quicksliver says ?? When i go the boat it had a 10 1/2 x 11 pitch and it was doing 16 knots and it was a bit choppey and i was full throttle and couldn't keep up with my m8