Home › Forum › Ask A Member › Johnson K-40 pistons › Re: Johnson K-40 pistons

#59708
Tom
Participant

    US Member

    The K-40 is an opposed twin, with exhaust out the bottom. So the deflector on top of the piston goes side to side across the piston. The 9.9 is an alternate twin, with exhaust to the side, so the deflector goes up and down. So even if they fit, and the distance from the crown to the pin is the same, the motor won’t run.

    T