1968 ski twin, tach and kill switch circuit

[samboatman]

Hi, New to this site. I have an 68 ski twin. I want to hook a tach up and find out how the kill switch circuit works. The motor did not come with factory wiring loom or control box, all the connections will be made inside engine cover.
thanks
Sam

 

[F_R]

Re: 1968 ski twin, tach and kill switch circuit

Hi, New to this site. I have an 68 ski twin. I want to hook a tach up and find out how the kill switch circuit works. The motor did not come with factory wiring loom or control box, all the connections will be made inside engine cover.
thanks
Sam

Tachometers for that motor haven't been made for years and are about as rare as chicken fangs. When they were made, they connected to ground and one of the two black wires coming from the magneto and going to the ignition switch. Modern alternator-driven tachs simply won't work on it.

Nowadays, about your only option is an inductive tach (www.tinytach.com). It is a little digital tach that gets its signal from a wire wound around a spark plug wire.

 

[samboatman]

Re: 1968 ski twin, tach and kill switch circuit

Tachometers for that motor haven't been made for years and are about as rare as chicken fangs. When they were made, they connected to ground and one of the two black wires coming from the magneto and going to the ignition switch. Modern alternator-driven tachs simply won't work on it.

Nowadays, about your only option is an inductive tach (www.tinytach.com). It is a little digital tach that gets its signal from a wire wound around a spark plug wire.

Thanks F R.
So the black wire comming from under the flywheel is the wire i ground out too kill the engine?

 

[F_R]

Re: 1968 ski twin, tach and kill switch circuit

Thanks F R.
So the black wire comming from under the flywheel is the wire i ground out too kill the engine?

There are supposed to be TWO black wires coming out. One goes to the vacuum cut-out switch, then on to the ignition switch. The second one goes directly to the ignition switch. When turned to the "off" position, the ignition switch electrically connects the two wires together to kill it.