tilt and trim

1984 70hp Evinrude kicks up in reverse. Have motor all the way down and it will kick up if you give it any amount of throttle. Shouldn’t the t/t hold it down?

Does it has electric trim? If it does that should hold it down.

Cape Horn 24OS
twin 150 Optimax

Yep, got a switch on console. If you need to back up quickly or just trying to back off trailer it will raise up just like a manual unit.

yes it should stay down
if not, and the trim works up and down, the shuttle valve in the hydraulics is probably stuck

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Thanks Chris.