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    Can lower OPEN value of overheating sensor, sound false alarm?

    Thermostats usually open ay 143*F. Engines will run at 180* F or less. So unless you measured your overheat sensor wrong, it is really out of whack. Closing of the sensor triggers the alarm. So yours doesn't close until 45*F above the boiling or water?
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    impeller in need

    Those telltales do clog easily, however, because the motor has a telltale stream doesn't mean the impeller is good. When was the last time the impeller was changed? If 3 years or more, it is time to replace it. You will want to replace as a minimum, the impeller, SS wearplate and 2 gaskets...
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    AC delco ignition

    What is wrong with your distributor? A lot of parts can be replaced.
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    Ideas for an old trailer?

    I tuned my old trailer into a flatbed, designed to carry 2 snowmobiles. Although I never actually hauled any snowmobiles, I did haul my Yamaha 360 enduro, sofas and tables, chairs and about 1 ton of topsoil. I only hauled the topsoil about 3 miles. It really wasn't up to it.
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    Wonder if I should go IO again or go OB?

    I/Os are obsolete, IMO. I do not see new ones of those at all. All the new motors are 4 cycle OBs. Someone should check the I/O units sold over the past few years. OBs now have 400HP 4 cycle engines, which outclass the 7.4L BBC I/O. A 150HP OB will outperform a 205HP 4.3V6 I/O, and a 115HP...
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    1150 Link & Sync Question

    You do not need new main jets, unless they are damaged. Make sure you clean the idle jet (idle restrictors is correct term), and the small holes from the idle circuit into the carb throat. Set the float height correctly and use new gaskets, plus new inlet needles and seats. You may or may not...
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    Mercontrol

    The RPM normally rises in those controllers, as you pass 10 o'clock, CCW. Full throttle is about 7:30-8 O'clock You can adjust the control cables, at the engine. Set the control to neutral, 12 o'clock, cold start lever down. Remove the clamp on the throttle cable at the engine. Adjust the...
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    Help Please Newbie 1976 Mercury 850 Tilt Trim Wiring. Serial number 4425319.

    OK, simple version. PTT is standalone system, not connected in any way to engine. PTT pump/reservoir has it's own battery cables. Make sure these are connected and clean. PTT motor is 3 wire type. The black wire from the motor should be connected to the PTT bracket. PTT bracket should be...
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    06 Johnson 90 2 stroke slow activation

    Usually those V4 motors have a two wire heat sensor and a 1 wire heat sensor. The 2 wire heat sensor also controls Quickstart. So when cold, the white/black wire is grounded. When overheat the tan/blue wire is grounded. Also, whenever the motor is started, hot or cold, it will go into...
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    Starter issue

    Check the maxrules web site. They have common wiring diagrams. There is a table that will give the year of your motor, by the model number. Pick out a wiring diagram of your year and HP if possible, but usually one of about the same year and about the same HP will work as well.
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    Tach is working and not working

    A lot of tachometers stay at their last reading, when engine is shut off. They usually zero when key is switched on, but engine is not yet started. You might look up your tach on the OEM website and see what it is supposed to do.
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    ideas to mount square saddle tanks

    Conduit could be PVC pipe, spiral plastic or the split corrugated plastic for electrical wires, whatever you think appropriate. You have that mess of purple wires and that multi wire cable hanging out. Something (fish hook, boat pole, toe...) will catch in it and damage it or you. Heck...
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    Mercury blackmax 150

    The link and synch from a '92 probably works for him. Not much changed in that era, as far as link and synch. The throttle arm may be a bit different..
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    Stator electrical replacement question

    Remember, on your motor, the stator has nothing to do with creating spark. it simply charges the battery, via the rectifier. You must have +12VDC on both the red and adjacent white wires on the switchbox, to have spark. Also the distributor trigger must work. there is an ignition...
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    Help Please Newbie 1976 Mercury 850 Tilt Trim Wiring. Serial number 4425319.

    I am not sure what those first 2 pictures have to do with the PTT system. Not sure what the first one is. The second one is the starter solenoid and switchbox. The third one is the male plug for the PTT system. That should be attached to your PTT switch and plugged into the pump/reservoir...
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    06 Johnson 90 2 stroke slow activation

    Gee, the overheat sensor is a temp switch. It is either open or closed. No other resistance value is normal. When the temp sensor is cold it should be open. When hot it should be closed. It is likely just a piece of wax inside the sensor. When hot the wax expands and pushes the contacts...
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    How should I fill this hole in deck?

    OK, kinda like a drywall repair, but needs strength. OK a dirty idea, assumes a round hatch. Not round would be easier. Cut a piece of plywood 1" larger in diameter than hole. Cut it in half and install hinge along cut. Drill hole near center and install nylon rope. Now cut a couple of...
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    ideas to mount square saddle tanks

    Those tanks have screw flanges, or so it looks. Why not glass a piece of wood to the gunwale and screw the tank into it? Alternatively, there are lots of straps for fuel tanks. Those could be screwed to the glassed on wood and wrapped around the tank. You need a conduit for those hoses...
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    1150 Link & Sync Question

    Parts 28-30 are balance hoses, between the three reed blocks. Replace them is they leak are cracked or are otherwise worn out. The pulse lines for the fuel pump have springs inside them to keep them from collapsing. They are tricky to route to avoid kinks. Maye sure that are clamped on both...
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    service manual

    Look for a silver welch plug on the block. Those often have serial numbers. The block number located about 1/2 way up the transfer cover side can help pinpoint it as well. The maxrules site will give you a list of serial numbers for your year motor. Does that work?
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