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  1. M

    120 Mercruiser 2.5L - No spark

    What is a base timing shunt?
  2. M

    120 Mercruiser 2.5L - No spark

    alldodge. Do I set the timing like I always do, 8 degrees BTDC? Or do I have to set base timing? How do I do that
  3. M

    120 Mercruiser 2.5L - No spark

    Thank you for everything, the tach wire off of the negative on the coil. Starts right up. Sounds great with the new carb rebuild
  4. M

    120 Mercruiser 2.5L - No spark

    Alldodge. Is there a way to test the black wire from negative on the coil to the distributor and screws on the side of the breaker points
  5. M

    120 Mercruiser 2.5L - No spark

    Oh sorry. How do you test a little condenser? Touch the condenser and the wire connector where it hooks on the points and check for continuity?
  6. M

    120 Mercruiser 2.5L - No spark

    The weird thing is it has worked for 3 summers how it is but would cut out all the time so I thought it was carb and gas issues
  7. M

    120 Mercruiser 2.5L - No spark

    I thought so . I usually have my shift interrupt or on the negative too but I thought that was the problem
  8. M

    120 Mercruiser 2.5L - No spark

    Here is a pic of resistors
  9. M

    120 Mercruiser 2.5L - No spark

    There is my set up. The white wire goes from the resistors up to the + side of the coil. The 2 browns are my tach?
  10. M

    120 Mercruiser 2.5L - No spark

  11. M

    120 Mercruiser 2.5L - No spark

    I have always set them at 18 thousands and it has worked fine before. It cranks over, rotor spins around, points open and close but no little spark when they open?
  12. M

    120 Mercruiser 2.5L - No spark

    How do you set the swell do you need a special tool
  13. M

    120 Mercruiser 2.5L - No spark

    Thank you for your reply. The 2 brown wires that are wrapped and heat shrunk(very nicely) to one connector that go to the - side of the coil with the black one that goes to dizzy, is that the tach wires. Everything you said. Is that all one task. Unscrew dizzy cap and pull it off I can see the...
  14. M

    120 Mercruiser 2.5L - No spark

    Hi there. All of a sudden I have no spark. I had the carburetor professionally rebuilt. Hooked it all back up. Lots of gas, I have clear gas hose from the fuel pump up to the carb. Should start right up right, nope. Crank and crank and pump the throttle…Nothing! So I ground my test light and put...
  15. M

    Mercruiser 120 - water shoots out exhaust manifold wrong way

    I have a 2.5L Mercruiser 120. It would over heat if I run at speed, then I could slow down and it will cool down, so I idled at the dock, tested the flow coming from the transom, loads coming in. Then I took the hose that dumps water in the manifold from the thermostat housing and water would...
  16. M

    Temp rises while under way

    I have a 1970 Mercruiser 120 that running great now. It first ran hot a couple of weeks ago so I put a new thermostat in and no change(143 degrees). Then split the drive and put a new impeller and housing on. At idle at the dock everything is fine but then plane it off and get going the heat...
  17. M

    Timing a Mercruiser 120

    1970 2.5L. When I’m timing it with my light is each bar on the harmonic balancer = to 1 degree or 2. I need it 6 degrees BTDC. Do I go towards the arrow away from the 0 on the dial
  18. M

    Shift Interrupter Switch Merc 120

    Could someone show me the wiring diagram for a 1981 Mercruiser 120 that includes the Shift Interrupter switch that slows the engine down to come into neutral. Also would you have a wiring diagram for a 1970 Mercruiser 120 because I had to put a new(used) engine in. All the shift cables and...
  19. M

    Mercruiser 120 Shift Interrupter Switch

    I have a 1981 boat that had a seized 2.5L and I put a 1970 Mercruiser 120 in it 2.5. Boat runs great. There is just a little problem when I bring it into neutral it is a bit harder than normal, it stays in forward for a second but my gearshift is in neutral and then just goes into neutral. I...
  20. M

    Mercruiser 120 no spark

    Ready to put my boat in. Went over everything, put the gas to it, strong roll over but no start, the plugs are wet but no start. I changed the coil and still nothing. What new parts do I have to change on the distributor to get it sparking?
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