1990 18 ft bayliner 1990 90hp force

[brodriguez]

ok i bought this boat had been sitting for three years it is like brand new 40hrs on it only one owner had old gas in it i drained it put new gas in it started it up works took it to the water pretty smokey when i start it i am mixing 50-1 is this normal once in gear seems good only in neutral it is smokey ok took off started opening up throttle adn windshield was shaky and i was only able to get 22-25 mph 4000-4200 rpm is this right for motor i was exspecting to go faster than that but i didnt my prop is 13-3/4X15pitch what can be going on i am sure the motor is good it starts up good and idles good as soon as it is warmed up hit the key and its on fast but no speed or rpm at wot help whats a good way to decarb this motor i just put new plugs in i have not tested it since i did that i have a pump rebuild kit also that ihave not put on yet any ideas thanks

 

[Frank Acampora]

Re: 1990 18 ft bayliner 1990 90hp force

With a 90 hores Force on an 18 foot Renken I used to go about 32 MPH and turn about 5000rpm.

So, Your RPM and speed are low for the combination boat and engine. also, 15 pitch sounds a little low. I'll bet you have that crappy black aluminum prop. I used to use a 17 pitch prop.

Since it has been sitting for so long, a decarb might help and cleaning the carbs would certainly be a benefit.

Are you adjusting the power trim to the proper angle? If you have the engine trimmed all the way in, that will certainly knock off a few hundred RPM and MPH. You should take off with the trim all the way down then trim up until the prop starts to ventilate. Thrim down slightly 'til ventilation stops and that's the correct running attitude.

 

[Bigprairie1]

Re: 1990 18 ft bayliner 1990 90hp force

Take all of Franks advice, he is extremely knowledgeable on the Force products.
I have the exact same boat and motor (& year) w/ a 15 pitch prop. My motor seems to run well and the compression is good (probably all north of 115-120psi) and I hit something around 37+mph with a lightly loaded boat. I do not have a rpm/tach gauge on the boat yet so I'm not sure of my revs. I will assume they are probably up there given the resulting mph out of the boat. I do not have power trim/tilt so I have to live with the settings available on the manual adjustment.
I too will be following Franks advice and trying a 17 pitch prop out to see what the performance/speed results will be.
Again, follow Franks advice...he'll help you figure it out for sure.
Good luck and keep us posted.
BP

 

[brodriguez]

Re: 1990 18 ft bayliner 1990 90hp force

thanks for the info i will have carbs cleaned i am witing for my manual before i do that i need to put fuel pump kit on too is it normal for this boat to smoke a lot while it is warming up ? is it suppose o smoke through the pee hole in the back or just through the prop whats a good way to decarb this outboard and what brand thanks for info guys