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    1996 1997 FORCE 120 Charging & Ignition system test

    The 1995/1996 and later Force motors use a solid state ignition trigger sensor so you cannot perform a resistance check like the older models. The fact that the motor does run, maybe not all that great would indicate that it's probably OK. As far as checking the rectifier/regulator with an...
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    Help changing 1987 force 125 prestolite to 1996-98 mercury thunderbolt ignition

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    Need Advice on Chrysler 140HP Missing/Vibration

    The temperatures that you indicated are pretty normal. When you have the head off, check for any damage to the outer top edge of the pistons. A broken ring will often damage this area of the piston. Rotate the motor to move each piston all the way down to inspect the cylinder walls for any...
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    Alternative CDI?

    Here are some pictures of the different flywheels. Original Prestolite Ignition system flywheel. What I believe is a 1991 - 1994/1995ish SwitchBox ignition flywheel. This is the one I used. Later model 1995/1996ish - 1998/1999 CDM ignition system flywheel. Crankshaft snout hole is larger in...
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    90 hp Ignition Question: Thunderbolt VS Prestolite

    I converted my 1988 125 HP Prestolite ignition system to the 1995 and later Mercury Thunder Bolt CDM ignition system and haven't looked back. Had to change the flywheel, stator, ignition trigger mount and ignition trigger itself. Also had to get the CDM coil wiring harness, and CDM mouting...
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    Force l drive fuel bowls

    Are these what you're looking for?
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    Mercury Force 120hp Fuel Port Cover Issue and Carb Overflow

    With only 30LBS of compression in that one cylinder, that means you are not getting full power. Usually a broken ring, damaged cylinder walls, or bad piston, is the cause for low compression. Sometimes all 3 things occur together. To correct this you may need to replace the piston and rings...
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    What octane gas to run? Ethanol free required?

    This is what I use to mix. All of the Force outboards run 50:1 like wrvond says. Look at the mixture ratio at the top (there are several different ratios 33:1, 40:1, 50:1 etc), fill up your tank and make a note of how many gallons you put in. Look at the gallon/litre scale under the 50:1 ratio...
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    1989 50hp force cooling/water jacket question

    I've attempted to show the water flow. Water enters the water jacket at the red 4 point star from the exhaust cover/block. It flows down the left side of the water jacket, around the bottom of the lower cylinder and up the right side (Red Arrows). At the top, the water enters the head at the...
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    Tilt line leaks at VB connection

    The seal is made between the cone shaped area around the hole in the valve body and the flare on the end of the line. This is how most hydraulic fittings seal. If there is a leak, either the end of the line is cracked/deformed or the cone shaped area around the hole in the valve body is...
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    1989 Force 125 on 89 Arriva 19.7 ft. bowrider

    I use a remote starter switch similar to the one shown. Just clip one lead to the small yellow wire on the starter solenoid. The other clip goes to the large battery cable that goes back to the battery (not the one that goes to the starter itself) on the starter solenoid. Just press the switch...
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    tilt trim valve body repair

    This is the bracket that I use. I've seen them on the auction sites, but can be easily made if you have access to a welder.
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    help lower unit shift screw!

    There is a large "O" ring seal around the prop shaft bearing carrier. The gears just sit on the shaft and slide right off. Attached below is a diagram of the shifting mechanism. The diagram is illustrated with the front of the lower unit pointing to the left. The "L" shaped shift coupler (shift...
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    1999 75hp Force (need help finding the neutral safety "switch" so I can jump it)

    On the later model Force motors, the Neutral Safety switch is usually mounted inside the Throttle handle Assy. It's two Yellow/Red wires that go to the switch inside the Throttle handle Assy. Instead of having someone crank the motor with the throttle wide open, and jumpering the Neutral...
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    Pivot pin for lower unit

    Here is a drawing of the set up. Moving the Shift rod up and down, makes the shift coupler or shift fork pivot on the pivot bolt (the one you accidentally removed) and the two pins on each side of the shift yoke are egaged in the two slots cut into the shift coupler. The picture is a bit...
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    Misfire 1998 90 hp force

    It's possible, however the trigger used a solid state Hall Effect sensor, so you cannot use resistance to check it. You need a multi-meter with a "Diode" checking function. Just so you know what to look for, here is a picture of the underside of your flywheel with the six magnets. The stator...
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    Force 50 HP Cooling passages Blocked

    Water comes up to the adapter plate attached to the bottom of the block, then flows up through the exhaust cover to the top left side of the block. Then it flows down the left side of the water jacket around the cylinders, then up the right side of the water jacket around the cylinders to the...
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    94 model 120hp force piston help

    Here is a picture of the Power Head Service Specifications from my Clymer manual. It doesn't actually tell you what the piston to bore clearance is, but it does tell you what the standard bore size is 3.3750 - 3.3762 inches ( 85.73 - 85.76 mm). Standard Piston skirt size is (90? to pin bore)...
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    Firing multiple times on one cylinder

    What you're seeing with the timing light seems a little odd, but I do know that with many automotive distributorless ignition systems use what they call a "wasted spark" ignition system. That is the ignition system fires some of the spark plugs when the piston is not on the intake compression...
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    1990 Force 90 Ignition Not Firing On All Cylinders

    It's in my Clymer manual. Page 156.
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