I just took ownership of a used boat from a family member. I put it in the water and started it to realize the cooling indication was not squirting water. I took the screens off the water intake to find the blades of the impeller. I took off the lower unit to find not much left of the impeller. So, I went on the quest to order parts. I found the serial number plate and it has this 'BAMJ-1400927' and 'BF20'. I found this odd since the engine cover says 9.9. I called the dealer today to find the water pump rebuild kit and read them the serial number. They said you have a BF20 and I said, but the cover says 9.9. We were both confused. The water pump kit for the BF20 fit fine. Today I took it for a cruise. It surely feels like a 9.9, could barely go 7 MPH on a fiberglass 14' twin vee.

So the question is, do I have a detuned BF20? and if so, is it possible to tune it to 20HP?

Thank you