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  1. M

    temperture ratings

    Force 70 HP (1991) Is it acceptable to use a lower temperature rating thermostat? I was given a new 110 that fits but my old thermostat is 130.
  2. M

    Test tank

    Getting ready to start and run a recently purchased used 1991 70 hp force and I have serviced the motor, new rubber, bulb, impeller new gear oil, compression is good and the carb. cleaned and adjusted. My question: I have a good 70 gallon heavy duty deep tank to test the moto
  3. M

    thermostat opening temp.

    1991 70 hp force Noticed when testing newly purchased thermostat that it did not open until 140 degrees and it was installed with the small weep ( very small hole) at three o'clock instead of 12 o'clock, my overheat buzzer keeps going off and wondering if the 140 degrees opening temp. is...
  4. M

    Overhearing again

    1991 70 hp force I have gone full cycle on overheating causes and still have overheat buzzer warning after Two to Five minutes of operation. Replaced lower unit driveshaft seal, water pump bottom plate, gaskets and impeller ( stainless housing looks good). Pulled power head off...
  5. M

    Carb. rejet

    hello: Have a new 2014 6 hp Nissan 20 inch shaft motor. Question: The elevation on the motor use will be about 5200 feet and this is my first four stroke, To rejet for elevation Is it necessary to change all three jets or just the main jet. Thanks to all.
  6. M

    lower unit tip

    Had a difficult time installing a 70 hp lower unit and took a time out to think how to make the job easier, found Three 3/8 bolts 4 1/2 inches long; cut the heads off and bolted into motor leg to use a guide. really helped line up the lower unit. just thought I would share the tip.
  7. M

    Carburator adjustment

    Hey all you carb. experts out there. Attempting final adjustments before my actual lake run ( 70 degrees here), I have a used Force 1991 70 HP with a tillotson TC111A carb. the float adjust was wrong and I corrected the float height but cannot correct the float drop because the tab is plastic...
  8. M

    TNT grounding

    1991 force 70HP model 706X91B Converting from manual tilt to power TNT, mechanical all done and found a used wire harness 819514A2 and it has minimal ground wire(s) length and asking for advice on correct ground hook up. This engine has a terminal bracket F438493 gold in color and has a tab used...
  9. M

    Fuel filter yes or no

    1991 70 HP force Model H0706X91B The iboats diagram shows the omission of the inline fuel filter. but their is a screen filter in the fuel pump between the tank and carb. I recall Frank recommending adding a filter between the fuel pump and carb. I am seeking a recommendation whether I need to...
  10. M

    Preventative maintenence question.

    I am finishing up going through a 1991 70 hp force and want to know if rebuilding the fuel pump (valves and diaphragm), is considered normal preventative maintenance. I have a original service manual and looks easy enough and the last time I used the boat it consumed about six to seven gallons...
  11. M

    Propeller shaft backlash

    1991 Force 70 HP Just finished rebuilding the water pump and noticed that Force service manual listed the Propeller shaft backlash and my backlash checked according to manual is about .200 of a inch. my last usage of the motor was fine. Should I just get my nose out of the service manual and go...
  12. M

    Exhaust tube seal

    1991 70 HP exhaust tube red rubber seal to inner motor leg part; number F749736 is no where to be found and trying to come up with the correct material to make a new seal. I am guessing it is red silicone rubber, are their any options of different hopefully cheaper material that will do the job...
  13. M

    water pump bolt insolators

    The 1991 70 hp service manual cooling section diagram calls for insulators on the water pump housing bolts, are they still required and if they are required what is their purpose? Thanks again for your input.
  14. M

    1991 70 HP force exhaust plate

    My first thread, please have patience with me. I ordered and received a new exhaust plate with matching part number, but they look different. The old plate has a long deep formed cavity and the new plate is just flat, both new and old have the same hole and cutouts pattern. I talked to all the...
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