120 force help fast(please)

[bobmoore]

force 120 l-drive ,i took a couple for a ride today to sell the boat ,the boat ran great.on the way back to the docks it started to sputter ;i was running low on fuel ,they did buy it ,i then took it over to the pumps i put 3 pts oil in it 18 gal. of gas .took it out to the lake and it started to sputter worse ,checked the pump ,plugs wires now no.3 plug shows on fuel on it ,i,m going to put new lines on it sunday can i put a electric fuel pump on it and if so what type .i have till noon tomorrow to get it running good ,thats when there going to pick it up ...so help please

 

[12Footer]

Re: 120 force help fast(please)

Hi, Bob.<br /> If the rest of the plugs are not dry,and that one plug was, I would not think delivery is the problem.<br />More likely, it's low compression on that cylinder. Is it the bottom pug?<br />If so, it might be the head gasket.

 

[12Footer]

Re: 120 force help fast(please)

Just got to thinkin..Didn't you recently pull the head? If so, re-tourque the bolts.<br />It may "cure" the problem if it is low compression.

 

[bobmoore]

Re: 120 force help fast(please)

yua i did ,about 6 weeks ago .but yesterday and early today i had no problems ,but i,ll retork them

 

[bobmoore]

Re: 120 force help fast(please)

no it,s thrid down on a four clyinder<br />..what about the check valves

 

[12Footer]

Re: 120 force help fast(please)

Reeds? a possability. But if so, you would hear a pulsing hiss out of the carb (kinda like a 4barrel qaudrojet carb on a car without an air filter on).<br />You might try opening the idle screw a quarter turn on the lower carb,and see if it improves.

 

[tiffany's dream]

Re: 120 force help fast(please)

consider it a blessing to get rid of it! The force 120 has been a problem for me for the past 5 years!

 

[bobmoore]

Re: 120 force help fast(please)

torn it down today,no.2 burned piston broken rings ,no.3 burnt plus two holes in the side of it well thats about it ,i,m looking for a used one ,.or should i rebuild this one .

 

[billum]

Re: 120 force help fast(please)

I have a 1990, 120hp Force and it has been a pain in the butt since new. It will run good for a while, then one problem after another. Latest is fuel pump. I have had overheating, water pumps, ignition, coils and other problems. Wish I would have paid an extra $2,000 and got a Mercery.

 

[page62]

Re: 120 force help fast(please)

Ouch! And to think you were THAT close to selling the thing...

 

[manowar]

Re: 120 force help fast(please)

I rebuilt mine and wasnt impressed when I rebuilt closer to factory compression spec han the factory I thouroughly cleaned everything and have a new rebuild I do have some spare parts if interested mines a 1999 120 Force

 

[bobmoore]

Re: 120 force help fast(please)

yea money in the pocket .i,m buying new rebuilt unit tomorrow ,its a 125 1988 model,should run a little better ,you think.

 

[manowar]

Re: 120 force help fast(please)

tell u what if ypu rebuild and do it just right your motor has to do you right the 120 has 33 ft lbs on the connecting rods and 20 ft lbs. on the head all others around 20 and those ones that dont thread try cleaning them your piston rings have dots on one side and they all face to the top of the motor the rings are concave on top and flat on the bottoms use alot of white lithium engine rebuild grease your connecting rod caps have to go on the way they came off or they wont tighten right and beleive it or not they should slide to the left and right but not up and down well compression should be between 160 and 170 any thing over or under that is not good i could go on all night hope this helps

 

[bobmoore]

Re: 120 force help fast(please)

i bought one from a boat shop that fixes and rebuilds boat motors , this is a regular shop ,i i.m not doing this myself do understand that.

 

[manowar]

Re: 120 force help fast(please)

where i live theres only 1 place that rebuildes they mke more money on rigging and tunes and etc. good luck