1987 70 HP Yamaha, power tilt/trim

[CT-Kurt]

I just purchased a 1987 15" Boston Whaler Super Sport Limited, with a 1987 70 HP Yamaha, 2 stroke oil injected outboard.<br /><br />Motor runs great, but the power tilt & trim won't hold the motor where you set it. If I set the trim while underway, after 2-3 minutes the motor is all the way in the down position. Also if I tilt the motor completely up/out of the water, over about five minutes it drops down into the water.<br /><br />Any ideas in what to look for?<br /><br />Thanks!

 

[Kinglg]

Re: 1987 70 HP Yamaha, power tilt/trim

Maybe you should check the tilt manual bypass screw<br />to see if it is open.

 

[CT-Kurt]

Re: 1987 70 HP Yamaha, power tilt/trim

Kinglg,<br /><br />I cheked the manual by-pass screw last night and it appears to be tight. I opened and closed it a few times and it seems to close down tight.<br /><br />Is it posible the cylinder seals are leaking by from the bottom to top?<br /><br />Thanks for your help!

 

[Kinglg]

Re: 1987 70 HP Yamaha, power tilt/trim

Sounds Like it could be bad seals. Look and see if any oil is dripping or present near the pistons.

 

[Jaybyrd]

Re: 1987 70 HP Yamaha, power tilt/trim

Having the exact same problem with my Yamaha 90 hp Can you tell me what solved your problem? Jaybyrd@compuserve.com