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new boat owner motor question

R

risoworker

New member
Hi,
I just bought a cheap bayliner capri that has been sitting for awhile. I bought a new battery but didn't want to
fire up the motor yet for fear of killing it. The motor is a force 1251x8b. I do not smell fuel in the tank or see anything there. what is the first thing i should do to the motor before firing it up. I know cars pretty well but this whole boat thing is new.
thanks for any help.
 
First thing: do a compression test then a spark test.
That way you won't be wasting $$$ on a dead horse.
That ok.
Then change the gear oil then, check the fuel pump diaphragm.
Then drain the tank or make sure there is no crud in it.
The old fuel lines will probably need replacing.
Possibly clean the carbs.
 
Jerryjerry05 said:
First thing: do a compression test then a spark test.
That way you won't be wasting $$$ on a dead horse.
That ok.
Then change the gear oil then, check the fuel pump diaphragm.
Then drain the tank or make sure there is no crud in it.
The old fuel lines will probably need replacing.
Possibly clean the carbs.
Click to expand...

i removed the plugs and ordered new ones. i also sprayed the cylinders with marvel mystery oil
to loosen the rings if they are stuck. couple of questions.
what should the compression be?
is there a air filter on boat motors? sorry i'm a car guy but i figure there must be a air filter.

also if it does start up how do i keep water on the gears to cool it down. i noticed some use a hose but i
do not know where it would go.
thanks
bry
 
You put ear muffs on outdrive where you will see holes on the bottom.Do not run engine without putting on ear muffs and turning o water. You should check water pump before you do anything.You usally have to do this every year.
 
Different gauges read differently.
The results should be real close.
Within 5-10# of each other.
My gauge could read 145 your could read 120??
Get a big container. Deep enough to cover the cavitation plate by at least 4 inches.
Using the hose? Make sure the pressure is real strong.
 
I did a compression test and the top cylinder was 130 and the bottom was 135. I got it running in a 55gal barrel of water with the hose keeping the tank full and it seemed to run good. It had a good stream coming from the "pee" hole, it wasnt a hard strong stream but it was steady and seemed like it was getting good pressure. I am going to take it on the water tonight and see how it runs under a load.
 
Jerryjerry05 said:
Different gauges read differently.
The results should be real close.
Within 5-10# of each other.
My gauge could read 145 your could read 120??
Get a big container. Deep enough to cover the cavitation plate by at least 4 inches.
Using the hose? Make sure the pressure is real strong.
Click to expand...
I pulled the plugs and I'm thinking the worst.

two plugs were dirty and bottom two spotless looking new out of the box.
I'm thinking a head is cracked and washing the plug.
 
The 90# is probably your gauge.
The important thing is the results are all the same.
You take all the plugs out to do the test?
Get another gauge for another test.
On the carb is a screw with a spring.
That's the low speed air screw.
Take it out and check the taper for damage.
Then "GENTLY" back in till lightly seated.
Then out 1 and 1/8th turn.
Start and let it warm up.
Then as it's idling about 1100 rpms turn the air screw in 1/8th turn. Wait 10 seconds and then another 1/8th until it coughs or buck then out 1/2 turn.
Repeat on the other carb.
Do this twice.
 
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