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When I bought my 16ft jon boat I had a Tohatsu 20 HP put on it that has the power tilt capability from the throttle.

Needless to say, when I am sitting dead in the water the motor will go BOTH up and down no problem. But, once I get up around 3000 RPM, I can only DROP the motor.....I can NOT LIFT the motor.

The guy that put the boat together for me said when I asked him about it that was pretty much normal. Really?

Does anyone else experience this? I start with the motor level to slightly high, then as I increase speed moving from one place to the other, I may drop it down to plane better, but if I drop it too far, I have to decrease my RPMs to below 3000 to bring the motor back up.

(oh, and to other newbies, my boat could have taken a 35 HP motor.....I wish I had gotten one. The 20 HP in reality does what I need....but let's face it.....bigger would have been better!! )
 

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When you are under power the tilt is fighting the thrust of the motor to raise, so either it does not have enough force in the tilt cylinder or the relief valve is bad. There is a relief that bypasses fluid when you reach the end of the cylinder stroke, it could have too low of a setting or could be partially open due to contamination. This is where I would look first.
 
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Most motors will have trim cylinders and a tilt cylinder. Under power it will only raise within the range of the trim cylinders as trimming the motor all the way out of the water at speed would cause loss of control and probably engine damage too.
 
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