1992 force 150 hp spark plug torque

[bluebackfisher]

Hello to all, I'm new on this forum! I recently purchased a 1992 Force 150 horsepower outboard on a 92 Bayliner. It starts and runs pretty well but between 1200 and 2500 rpm it stumbles or sputters then clears out and runs smooth on plane? My first guess was to check the spark plugs and install a new set of plugs since I already cleaned out the carburetors. I was wondering what the torque was for the spark plugs if anyone knows? I was also wondering if anyone else had the same running issue on their motor and what could be causing it if not the carburetors and the plugs. Could it be the Reeds?

 

[racerone]

Reed valves are very reliable.----I would do a cylinder compression test first.----What are your values ?

 

[Sea Rider]

Install plugs finger tight and then torque each one till the compression ring is compressed and seated.

Happy Boating

 

[racerone]

Torque on sparkplugs is typically around 15 to 17 FT-LBS

 

[bluebackfisher]

Racerone and sea rider, thanks for your help! Compression was taken recently by a good shop when the previous owner owned it. The values were stated to range between 110 and 115 psi among all 5 cylinders. That was a little over a year ago, so I was going to check the values myself this weekend. I'll post the values that I get.

 

[Nordin]

110-115 PSI looks pretty low. Factory spec calls for 145-165 PSI but that low readings can be the compression gauge if they are about equal at all cylinders.

Low compression would cause low power and low torque, as you state it sputters and stumbles around 1200-2500 rpm and then clears out I would suggest you to check the settings of the air/fuel mixture screws.

They should be at about 1-1,5 turn out from seated. If they are more out the engine will run rich at idle and low rpm, then when you open up the throttles it clears out.

If your engine has a primer instead of regular choke butterflies check the primer from leaking.
Pinch of the hoses going from primer solenoid to the intake manifold behind the carbs and check if the issue disappear.

 

[jerryjerry05]

Don't think they have compression rings on the plugs for any Force/Chrysler???
The manuals I have don't give a spec for the tuorqe on plugs.
About 10# is what I use.

The comp: as long as all 5 are close that should be ok.
Different gauges and procedures will give different results.

Running rough: test for air leaks or sucking air.
Starting fluid sprayed around the intake side of the motor, that includes the 5 port covers on the port side
of the motor and base of the carbs.
If spraying makes any difference?? then it might have a bad gasket somewhere??

Reeds: ANY??? fuel being sprayed from the front of the carbs??
They sell a tiny bore scope camera that connects to the newer style phones.
I bought one $11
It will show if there is any damage to the reeds.
Or remove the carbs and inspect ??

 

[bluebackfisher]

When I tested the compression myself, which I had to wait until I was able to get my hands on the compression tester, the readings were all the same for all five cylinders at 105 psi. I may not have let the motor warm up long enough since the spark plugs were barely warm to the touch? I will be getting a used service manual for that motor in the next few days and plan on checking the timing and see how that helps. When I cleaned out the carburetors I only used carburetor cleaner spray and did not soak them overnight. Maybe there is a partial obstruction in one of the mid range circuits of one of the carburetors? I will be getting a new starting battery tomorrow and hopefully have it hooked up this weekend so I can test the battery voltage when being charged. Can someone tell me what the amps should read coming from the regulator? And thank you so much for everyone’s replies and help!

 

[Nordin]

I do not have the spec for the 92 year model but the spec for the 91 A model.

Charging amp min 1,0A at 1000 RPM, cut-in speed 800 RPM.
Max 7,0A at 3500 RPM.
The output voltage with a good regulator connected should be 14-14,5V

 

[jerryjerry05]

The comp. Can be taken cold or hot.
There shouldn't be much difference either way.
99% of the time , if the comp is low across the board?? then the gauge is usually the problem
or the way it's taken is the other %
The WORLD is flooded with CHEAP, CHEAP Chinese CRAP.
Harbor Freight testers, new right out of the box can be as much as 65-70# low.

The GOOD thing is all 5 cyl. are the same at 105.