The engine goes OK but the prop does not drive the boat, except at snails pace?
Check the Drive Spring. The end of the spring should protrude out of the side of the prop with a 90 degree bend on the end. If you cannot see the end, it will be wrapped inside the prop, the motor will now only drive a tick over, as the end of the spring is possibly lightly jammed against the inside of the boss. It will cut a groove in the Ali prop and often this is seen. Replace the prop spring and all will be well again, don’t worry about the groove worn in the prop! This is the page from the workshop manual with the distortion tolerances shown. These drive springs are so cheap, still 3.50 each in 2009, you should always have a spare. Without one the motor could be useless! I recommend tying a spare to the tiller arm, I use an electrical tie!
