tach problem

[baker]

96 VX600 - the tach goes right to 9000 when you start the sled. It stays at 9000 at idle. If you rev the motor, it moves up a little, but just kind of swims around 9K.

I unplugged the tach lead right under the dash - tach drops to zero. plug it back in, goes right back to 9K.

The plug only fits one way: can't plug it in "backwards".

Any ideas?

Thx.

 

[terret725]

trace the wires back and look for a short. exspecaly where tehy go by teh pipe make sure they are not melted or under the motor for a rub threw

 

[baker]

Thanks, I'll check it out.

 

[Waterfoul]

Where does the tack pick up the signal? Could also be a bad sensor or some kind. I'm real familiar with carb boat motors and picking up tach signals... but these stator style 2 strokes are pretty greek to me. Just how does it pick up the rpm signal?