1997 force by merc 120

[64BOOMER]

All, I have a 1997 Force / Merc 120hp. To start I must use the throttle forward unless she stalls out. No change after running for a while. On muffs starts fine. Had a mechanic check all the ignition system outputs, trigger and stator. Compression good, carbs removed and cleaned out. Choke seems to working good. Once started put in gear and sometimes stalls intermittanly, can get in trouble on windy days at the dock. Plugs new. Any advice?

 

[roscoe]

Re: 1997 force by merc 120

Welcome to iboats boomer.

So the spark is good and strong?

And link n sync was performed after carb work?

Seems like you covered all the bases but the idle is still too low.

It won't idle in neutral at all???

 

[pnwboat]

Re: 1997 force by merc 120

Have you checked the fuel pump diaphragm?

 

[64BOOMER]

Re: 1997 force by merc 120

Thanks, mostly at start up difficult to idle in nuetral. I do run it with stabil if it makes a difference. I have not replace the F/P Diaphragm yet. My mechanic was leaning towards a possible failure in the head gasket between 1/2 however no real indications of loss of compression etc.

 

[fucawi]

Re: 1997 force by merc 120

of course your mechnic says its a head gasket there is a profit in that and maybe broken bolts and extras.... machining work .......do it yourself

 

[64BOOMER]

Re: 1997 force by merc 120

I do understand that, I will replace the Diaphram tonight and hold off on the Head Gasket for now. I will do it my self.

 

[64BOOMER]

Re: 1997 force by merc 120

Installing a F/P Diaghram kit seemed to work. Idles up and stays at idle. Now the Speedo stopped for some reason.

 

[64BOOMER]

Re: 1997 force by merc 120

Installing a F/P Diaghram kit seemed to work. Idles up and stays at idle. Now the Speedo stopped for some reason.

 

[pnwboat]

Re: 1997 force by merc 120

There's a flexible plastic tube that runs from the speedometer to a pickup either mounted on the transom or on the motor itself. If it's disconnected or squished flat, the speedometer will not work. If the pickup is mounted on the transom itself, it should hang down below the bottom edge of the hull. Usually it's a small white plastic thing. It may have gotten kicked up from hitting a small branch in the water. Just pop it back down. It's made to pop up to prevent it from getting broken off.

 

[64BOOMER]

Re: 1997 force by merc 120

Blew it out last night working today. All seems good. Thanks guys/gals

 

[64BOOMER]

Re: 1997 force by merc 120

Guys got a bad power head. #3 compression down to 105 scored walls and piston looks bad. How difficult is this and roughly price?

 

[64BOOMER]

Re: 1997 force by merc 120

Got my Power Head back by the end of October. Runs like a champ. Had a crushed bearing. Replaced all pistons, honed and "plateau finished". Definately picked up h/p and speed. Still breaking it in but back on the water..

 

[roscoe]

Re: 1997 force by merc 120

yeah !!