My force 125 will sink after it goes fully up, its a brand new tilt trim motor but when it goes fully up it will slowly sink back down, any reason for why it does this? Its a 1989
You replace the whole system or just the electrical motor?
Drifting all the way down is usually the hyd.pump.
Read the stickys like Jiggz suggested and get a manual, a factory one is best.