Re: Johnson QD12 10HP carburetor problem Home › Forum › Ask A Member › Johnson QD12 10HP carburetor problem › Re: Johnson QD12 10HP carburetor problem fisherman6US Member - 2 YearsReplies: 1702Topics: 34 July 21, 2018 at 2:07 pm #79837 Yes Bob, that is pretty normal behavior for these engines in my experience. They just don’t have a real smooth transition from low to high speed circuits. Irresponsible hand-off is a nice way to put it. 😆 -Ben OldJohnnyRude on YouTube