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[FishStretcher]

When the motor on my 370 lb yamaha F100 packed up, I unscrewed the relief valve a bit with a standard screwdriver, let it down, and went fishing. Then did the same to trim it up at the boat ramp. So it stayed locked down at sea. Maybe there is a similar valve on your OB?

It is heavy to tilt up and down and when it goes over center, it gets exciting- you could pinch a finger badly if you weren't looking.

Oh yeah. Nothing beats Kroil for loosening up parts.