Can't get my boat on plan..89 Capri 85hp force

[Jimbo82]

I'm new at boating,I trimmed the motor and everything..I get to 20 mph and the boat is still plowing with the boy up in the air.is there a certain speed I need to be before it starts to plan.Thanks

 

[steelespike]

I think the Capri was made in 14 ft up to about 20 ft, so we need the size.Do you know your gear ratio?
Need your prop size usually near the base of the blades or under the prop nut, Need your rpm.
Is the motor trimmed down all the way prop closest to the boat.
Start with a compression check
Follow suggested cautions when checking the ignition spark check and set the timing.
Check that the throttle opens all the way.Is the bottom clean and smooth?No bulges or hollows.
Sometimes these old timers have absorbed water in the foam under the floor. Raise the bow on the trailer and leave the plug out
Once free water has drained it should stop dripping.

 

[NYBo]

I'm going to guess you have 1700, either bowrider or cuddy. These came packaged with the Force 85.

The stock propeller is 17" pitch. In addition to proper pitch, the prop needs to be in good shape with no bent blades or major nicks. Have you tried moving weight forward? Steelspike offers some good info.

 

[Frank Acampora]

Most small boats plane at somewhere around 18 MPH. If you are achieving 20 MPH and the hull still does not plane I suggest that there is no major problem with engine or prop. Since you say that at 20 MPH the bow is still pointed up, that suggests too much weight in the stern and she can't "climb out of the hole.".

You need to check the hull for retained water.

 

[Texasmark]

Also watch your nomenclature. We just went through this a day or two ago with a guy with a 50 Johnson. Plowing is just the opposite of a bow up attitude like you have when the bow won't drop once on plane as speed increases! It screws up the thinking of those attempting to understand what's going on at your place and trying to second guess your probvlem.

 

[Jimbo82]

Thank you everybody,for the info.My boat is docked in Lake hopatcong.son ican't really look at any numbers or so on...Next time out gona have to try and shift the weight to the front insread of my wife sitting next to me.it is a open bow.

 

[Jimbo82]

No Title

 

[Chris1956]

It is possible that 20MPH is simply not fast enough to achieve plane, as planning speed varies by hull design and other factors. However, your setup should easily pass 25MPH, and be on plane. If 20MPH is all you can get out of the boat, something else is wrong. The motor is not making the correct power, or the boat weighs too much.

 

[Jimbo82]

The motor does have some issues just bought it a few weeks ago.The fastest I got it to was 28mph.Paid 700 for it..

 

[steelespike]

Sometimes older boats that may not have been stored right, may absorb water in the foam under the floor.
Sometimes if your raise the bow on the trailer and leave the drain out water will continue to drip long after any loose water has drained.
This water can add 200lbs or more at the stern where it really hurts.
Is the floor spongy in any spots?

 

[hunter200524]

There is a good chance that motor is blown up. Do a leakdown test and start from there. I decommission alot of 85 forces every year.

 

[Texasmark]

Looking at your picture, I think you are WAY ahead even with "decommissioning" the Force. Find you a good used engine. Look on the BIA cerification plate for max HP and get one of those or as close as you can below the limit....have to stay at or below due to law suit problems if in an accident or a ticket from the water cops for something silly like not wearing your life jacket.

 

[Frank Acampora]

I think you people are giving him bad advice about replacing the Force engine. That hull with that engine will only do mid 30s. If he is doing 20 MPH and pushing a lot of water with the bow high, you can not blame the engine. However, it would not hurt to perform a compression test to make sure the engine is OK internally.

I still say he needs to check for water in the hull and to try re-distributing weight before he does anything else.

 

[Bondo]

I still say he needs to check for water in the hull and to try re-distributing weight before he does anything else.

Ayuh,..... Probably wouldn't hurt to put a straight edge under the hull, 'n see if it's straight, or deformed,...

 

[Texasmark]

I think you people are giving him bad advice about replacing the Force engine. That hull with that engine will only do mid 30s. If he is doing 20 MPH and pushing a lot of water with the bow high, you can not blame the engine. However, it would not hurt to perform a compression test to make sure the engine is OK internally.

I still say he needs to check for water in the hull and to try re-distributing weight before he does anything else.

Ok Frank. I'll yield to the................"Force". Grin. "Let the Force be with you"..................."Star Wars". From the picture just looks like the hull would be capable of more than 30 with 85 ponies, soaked foam or not with just him aboard. Yeah a compression check is a good place to start. I guess I just don't like Chrysler or Chrysler (West Bend) makeovers having had a 55 twin and 85 triple on a 1971 16' Chrysler Sport Fury. I know you do a lot with them.