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Posts: 77
| I was out in my boat last week on bago.
17ft Starcraft Alum deep V. I recently added an 8hp kicker (4 stroke). I lost about 5mph, I thought that was quite a bit, at least more than I expected. The boat has an '04 115hp Merc 4-stroke EFI. I got about 40mph out of it before the kicker.
Last Wednesday I was up north, it started to rain. Put everything away and go. Full throttle, 7.5mph, didn't feel right. Obviously somethings wrong...
The motor won't trim up or hold trim under power. I trimmed it up and as soon as I hit the throttle, the motor came back down to the transom. It trims up/down fine when not under power.
I checked the oil in the reservoir and it seemed full (with the boat as level as I could get it).
Any ideas or suggestions are appreciated. Thank you. | |
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Posts: 3484
Location: Elk River, Minnesota | Hiya,
If memory serves me correctly, there will be a screw of some sort that you can turn tighter to adjust the hydraulic pressure. It has been a long time since I have seen an issue such as that, but that might be a start.
The next thing would be a bad seal on the hydraulic cylinder. It may not be enough to show a leak, but my guess is there might be some air in the system that can escape while under load.
I don't think the fix is hard or painstakingly long... My gut says an adjustment screw, but I will say that firmly with tongue in cheek.
Steve | |
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Posts: 77
| VMS - 6/6/2018 9:49 AM
Hiya,
If memory serves me correctly, there will be a screw of some sort that you can turn tighter to adjust the hydraulic pressure. It has been a long time since I have seen an issue such as that, but that might be a start.
The next thing would be a bad seal on the hydraulic cylinder. It may not be enough to show a leak, but my guess is there might be some air in the system that can escape while under load.
I don't think the fix is hard or painstakingly long... My gut says an adjustment screw, but I will say that firmly with tongue in cheek.
Steve
Thanks for the reply Steve. I sure hope you are right. I recently spent (WAY too many) hours wiring and networking electronics. I posted the issue on Lake-Link and one guy said he had a bad check valve and couldn't find parts, so he sold the boat.
Trouble is it works fine dry and has be to under power to show symptoms. | |
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Posts: 77
| I let the motor sit without the transom saver for 8+ hours. It hasn't moved down at all.
I stood on the motor - don't try this at home folks - (I'm 6'4" 270ish) and I could bounce the front of the trailer off the ground.
Tried to trim up, motor was still at the upper limit.
Any other ideas? | |
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Boat Trim/Speed