1989 force 50 horse no power

[idid35]

Hi there, i have a 1989 50 hp force that i loaned for a day and they ran it very light on oil and it quit running and would not start, at first i thought it was ignition. i have replaced the stator which had three of the coils on it burnt also replaced the cd pack and the coils from a used running motor. when the boat came home it would not start, all it would do was fire and try to run and backfire. i checked compression and it only had 50 lbs. on each cyl. i did get it running (barely) and i ran some sea foam through it and now i have 100 lbs. on top cyl. and 105 on bottom. it wont idle good and i had to raise the idle speed to keep it running then i took it to the lake and it run somewhat decent but with some power loss then i stopped and it died and had a heck of a time starting it so back home it went. now, it still has the 100 and 105 compression but i lost the water pump now so i have to get one. question is will this run good with that compression or not? any ideas on the hard starting and bad idle, i dont have a tach on it so i dont know what rpm it was turning. i replaced the fuel bulb with a new one and cleaned the carb and checked the fuel pump so i dont think it is fuel problem. i am lost to why it starts hard and wont idle good, any help would be appreciated.

 

[devl]

Re: 1989 force 50 horse no power

Hi there, i have a 89 50 hp force that i loaned for a day and they ran it very light on oil and it quit running.

Please clarify this part of your post. It will help the gurus find the problem.

 

[bentle]

Re: 1989 force 50 horse no power

I checked the clymer force outboard book just to be sure and your compression on that 1989 50force outboard should be at 135-150. The numbers you gave are not
within that range of course. Did you do a leak down test on each cylinder. Now
when you stated that not enough oil used, Do you know what kind of oil used, and what ratio did they mix oil with fuel? Did they over heat the motor? Just some
suggestions that may help you get a quick response.

 

[jerryjerry05]

Re: 1989 force 50 horse no power

The comp with a good guage is around 150#
Your guage may read different.I'd try another guage.Let it turn over a lot when testing the comp.
Those # good then I'd pull the head and check for damages.Low comp and the fuel pump doesn't work right.
Ran no oil or low oil could mean a rebuild.

 

[idid35]

Re: 1989 force 50 horse no power

The oil they used in the gas was a 2 cycle oil and they misread the lable on how much to use, they put 2.0 ounces in 6 gallon of gas, the lable said 2.6 per gallon i dont know if it got hot or not but they said it started to slow down and then died so i am thinking it got hot with that little of oil in it. I had another guy do a bleed down test and he said it was ok. I know the comp. is low but wouldnt it still run ok but not as good as it did, the fuel pump must be working because i squeezed the fuel bulb to see and the bulb was full and hard and i did clean the carb. which was clean. I havent checked the diafhram in the fuel pump i checked to see if screen was plugged and see if gas flowed through. Now. when it backfired several times would that have caused the diafhram to blow? havent checked that yet. I dont know if i want to rebuild or not i probaly could buy a used motor cheaper, maybe.

 

[bentle]

Re: 1989 force 50 horse no power

Will run? Yes off and on and with alot of swearing. Last thread stated the fuel pump will not
pump right and he is dead on. The fuel pump depends on good comp. to pump right. Backfiring shouldn't hurt the diaphragm, but im not going to rule it out either. I have had mine backfire
Without damage to my pump diaphragm. Prob. With buying a used cheaper motor is you prob.
Will be buying a bunch of new prob. Your powerhead is worth the rebuild and at a reasonable
cost. Always use a good marine grade 2 cycle oil with your motor with 87 octane fuel.

 

[jerryjerry05]

Re: 1989 force 50 horse no power

One back fire can ruin the diaphram.
Low oil and the walls of the cylinders can be scored.
Pull the head before you decide to replace the motor.
Profile?? You might be close to someone who can help.

 

[idid35]

Re: 1989 force 50 horse no power

hey sorry for the delay between posts but i got busy, well i pulled the head off today thought i lucked out when i pulled it off and saw the head gasket was shot but after checking the cyls. i didnt. The pistons have quite a bit of play between them and the walls and there are some score marks in the cyls. also, so i guess i dont have to play with it anymore. Anybody have a idea what it would cost to have this fixed? thanks for all the help.

 

[Frank Acampora]

Re: 1989 force 50 horse no power

Do the disassembly and assembly work yourself. 45-60 dollars per cylinder to hone, around 125 for each piston, and 25-40 for a head gasket 50 or so for a gasket kit.
So, around 400-450. HOWEVER: with that low amount of oil, you also need to check the roller bearings on the rods and the crankpins for damage. If either or both are damaged, it is not worth repairing.

 

[fucawi]

Re: 1989 force 50 horse no power

so there is a lesson to be learned here ..your outboard is like your wife ..if you loan it out you are looking for trouble.....

I remember a hire yard in Australia ...They supplied the fuel and if the unit you hired was 4 or 2 stroke you still got a 50:1 mix ....no chance of error

 

[idid35]

Re: 1989 force 50 horse no power

well it is going to cost 400 to 450 not to bad, i think i will start to pull the motor out and see what is out there for a good block maybe and check the machine shop for a price on the boring and when it is done and fixed it will stay home from now on. Thanks for the info