Home › Forum › Ask A Member › 1978 Johnson 75 hp Stinger stalls when throttled up › Re: 1978 Johnson 75 hp Stinger stalls when throttled up
The reason Pappy asked you about the WOT RPMs the motor will turn is because the 75 hp motor has a very peak power curve. Low end power is poor. Depends on the type of boat, but if the boat needs a bit of power to put it on plane, then you have to get the RPMs up or it will just stall. Now all systems on the motor have to be correct, but we (Pappy and I)wanted you to be aware of the characteristics of this motor. It needs to turn a full 6000 at top end to have any bottom end power. The fact the it starts and idles well gives you some idea that the engine may be OK. I had a ’78 75hp on a skiff and ran a 15" prop. We used it for trawling. It would run 6200 empty, but loaded we needed that to get out of the hole. We never ran that boat WOT. It was a great engine as long as you knew its limitations.Super on fuel!
Dan in TN
PS: Sorry I could never figure out how to get that TNT to you for under $100!