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    89 Force 125 won’t rev and bucks

    First of all check compression and spark at all 4 cylinders. Compression should be 140-150PSI, but lower numbers (about 110-135PSI) will be okey, BUT it is important that the numbers are pretty equal. Not more then 10-15% in different.
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    Mystery Solved: Overheats have consequences... 1987 Force 85 H.P.

    In think you can find the insert and the spring at Franz Marine or Ebay. At Ebay you might have to buy the whole rubber boot with insert and spring complete. It is important that you do not get any leakage from the boot, it has to seal at both ends. If not you get exhaust under the cowl and the...
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    Extra parts got my 1974 135hp back on the water

    From my experience and what I have read it is very important that the points is clean when you run with the Magna Power I battery ignition system. With the battery Magna Power I system or any other kind of CD ignition such as MDS or other brands, the points is the trigger for the CD box (it is...
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    Chy 140

    That part is F84342 seal inlet water line upper and seams N/A. Check with Franz Marine, he might have it.
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    Extra parts got my 1974 135hp back on the water

    If you have convert to auto style ignition as I think you have, there must be a condenser connected. The condenser has two functions. 1. Keep the points clean from arcing that will destroy the points. 2. It boost the spark at the plugs. If you have auto style ignition you should use regular...
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    1988 force 35hp wont run/wiring issue

    If you can post pics of the ignition system I can send you a factory electric diagram. Think the 35Hp in that year had three different ignition systems. Magneto, battery and CDI ignition. The reeds are kind of check valves for the fuel/air mixture at the crankcase. The reeds are stainless steel...
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    Starts off good then eventually dies

    I have not tear a diaphragm my self by squeezing the bulb, but if the diaphragm is old and brittle I think it is possible. Have you changed the diaphragm recently? If you have, then maybe the diaphragm do not manage the ethanol in the fuel. I am in Sweden Europe and we just have 5% Etanol in our...
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    1988 force 35hp wont run/wiring issue

    Why do you think the wiring is wrong? If you got spark and the carb has fuel then it should run if the fuel mixture is right and the spark fires at the right time. Are the spark plugs wet or dry? If dry then check the carb and clean it again, then check the reeds. If the plugs are wet then check...
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    1988 force 50 HP model c cylinder 1 no spark

    First, swap the coils and look if the issue moves. If it moves then the coil is bad. Also check the spring in the HT wire boot. It maybe rust and bad connection cause the spring is just pierced through the HT wire. You can check out Ebay for a "new" coil. Ebay is a good source for parts.
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    85 force 1989 firing issues please help

    Please pics of your wires and terminal block would help. I assume that you have the Prestolite ignition system, not the Thunderbolt system. Brunnswick started to put Mercury parts to the Force in early 90.es. The ignition system was one of the first parts. Prestolite system has 2 wires for each...
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    Force not getting over 2500rpms WOT

    Have you checked for spark at all 4 cylinders? You said tried 3 different fuel pumps, was the diaphragms new in those or old? Check for exhaust leaks from gaskets around the adapter plate where the power head is mounted to the leg. Check the exhaust rubber boot at the back of the leg for...
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    Timing on a 1974 75hp

    That sounds right but check if the flywheel key is not shared. When the 0 mark at the flywheel lines up with 0 mark at timing plate the top piston should be at TDC. If not the key is shared. Then you have to set the spark advance. With the throttle set at WOT the spark at top cylinder should...
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    1989 85hp WOT only 4300rpm

    As jerryjerry says check the prop, what size (pitch) and check the load. Force 85Hp 1989 should be equipped with Prestolite CDI ignition two CDI boxes and three ignition coils (black or blue color). One thing you can do if you have not done it is to check all the lugs under the shrink tubes for...
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    Finally Had To Retire It

    Too bad to bury a Chrysler/Force 50Hp engine. Sad that I am in Sweden Europe. Have a lot of impeller housing that would fit and work for a lot of years.
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    Gas spewing from Carb

    Dumps a lot of gas through the motor? Are you running it on muffs? If a lo of gas is coming out through LU (exhaust snout) probably the fuel pump diaphragm is bad. And yes as racerone mention "kick the secondary butterfly"? These engines has two butterflies, first one you see when you looking at...
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    Throttle cable maintenance and adjust basics? Force 85 H.P. or other..

    There are four adjustments for the carbs from the outside. 1. Throttle pick up point adjustment. 2. Throttle butterfly opening. 3, Idle screw setting. 4. Air/fuel mixture setting. When setting the carb you first start with the throttle pick up point adjustment and then the throttle butterfly...
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    1986 Force 125 hp popping

    Do as roscoe and raceone suggest, check the flywheel key. You do not have to remove the flywheel to check it. Set the throttle at idle (lowest setting as possible). Put a screw driver in top cylinder and turn the flywheel to set #1 piston at TDC. If the key is okey the timing mark should line up...
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    Force 507X8B Ignition

    I have looked at it closer and it seams like you have wired it correct. So some questions then. The brown wire at the new CDI box, where have you connect it and does the new CDI box have any black wire? From the diagram in #4 by The Force the CDI box should have a ground wire (black) and the...
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    1989 Force 35hp fuel pump issue

    The pump pnwboat refer to will fit your engine but you have to remove the adapter spacer #4 in the schematic, part number F658836. The pump body, the diaphragm and gasket is the same for both the 35Hp and 40Hp. BTW the pump body, diaphragm and gasket are the same for a lot of Chrysler/Force...
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    Fuel pump 1988 force 125hp

    The pedals should rest at the V-block surface without any gap. Well you could accept a very very small gap but not more then 0,003-0,004 in, in my opinion. Dead closed is the best. Each cylinder has a V-block with two sets of reed valve blades. One valve blade at each side and each valve blade...
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