question about planing out in my first boat

tvarno

Recruit
Joined
Aug 28, 2003
Messages
2
I just purchased a 1989 15 ft Bayliner (Cobra) with a Force 50. The boat does not want to plane out unless I put it to full throttle and have both of us climb into the front of the boat. Then it is fine. (until I slow down again)<br />I suspect it is the prop. It dosent look like it is factory. I think the pitch is wrong but I cant find a cross reference chart to find out. It currently has a 12.5 pitch. Any suggestions???
 

roscoe

Supreme Mariner
Joined
Oct 30, 2002
Messages
21,791
Re: question about planing out in my first boat

How high are the rpm's when you are on plane at full throttle? need to know if you are reaching the recommended rpm range, which is also the guide for making prop changes.<br /><br />Have you had the compression checked on the engine?<br /><br />One thing ALL Force motor owners should do is decarbon the engine. It can do wonders for a poor performing engine.<br /><br />Your intent is REMOVE the existing carbon buildup from the cylinders, heads, and rings, a spray decarb solvent product, such as SeaFoam Deep Creep, is needed to do the decarb process. Some people use one can per cylinder. Free moving rings are what seals your cylinders and gives you compression. Compressed and stuck rings equals loss of compression, and eventually, engine failure.<br /><br />Run engine at fast idle, with engine running, slowly spray liberal amount into each carb, its gonna smoke up the place,<br />spray for a couple minutes, now spray a larger amount into carbs until engine chokes out and stops.<br /><br />Remove spark plugs and spray decarb liberally into each cylinder, install the spark plugs, let it soak for an hour. <br /><br />Start the engine and run at medium throttle, or if at the lake, run it at full throttle. It won't hurt to spray some more through the carbs. Run it for atleast 10 minutes to flush the crud out of your engine. Now remove and clean, or replace the spark plugs. <br /><br />It works well to do the spraying, the night before you go to the lake. This way you can let it soak overnight, and really flush it out at the lake.<br /><br />Don't do this in front of the garage door or the house, unless you want it coated with greasy crud.
 

SCW71

Cadet
Joined
Aug 27, 2003
Messages
7
Re: question about planing out in my first boat

This may sound dumb but did you check your motors trim adjustment? There should be a pin in the back below the power head to adjust the trim. (The angle the motor sits in relation to your boat affects your plane and how fast you get on plane.) Unless you have a power trim then you may need to toy with that to get the results you need.
 

rbruce63

Petty Officer 1st Class
Joined
Aug 30, 2003
Messages
212
Re: question about planing out in my first boat

Planning is a matter of testing. Check the tilt position of your boat. The propeller for your Force should be in the vecinity of 10 1/8" diameter X 12 1/4" pitch, such as the 1982 Chrysler 50 HP. <br /><br />You should also check that the motor at wide open throttle yields 4500 to 5500, preferrably closer to 4500 and you will enjoy longer motor life.<br /><br />Bayliner is believed to have pioneered selling boats, trailers, motors and accessories that matched perfectly, (although I saw boat/motor/trailer combos in Chrysler catalogues), therefore, your motor-propeller combination is probably matched correctly to your boat wheight and type of hull.<br /><br />Good luck and have a nice shake-down cruise!
 

tvarno

Recruit
Joined
Aug 28, 2003
Messages
2
Re: question about planing out in my first boat

I de-carboned the engine and put on a set of Doel Fins on and the boat planes out now. (Though it takes about 40 - 80 yards to get up.) It is not the best but it is acceptable for me now. Maybe after a couple more tanks of gas with SeaFoam it will get even better.<br /><br />Thanks for the help.....
 
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