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  1. M

    Engine dies after 40 minutes

    Well I did drain the fuel tank and put a camera in the tank, it’s clean. I’m just really hoping I found the problem at the cannon plug. But if not, I will get it figured out one way or another.
  2. M

    Engine dies after 40 minutes

    Update 2: was able to take the boat out on the river this morning and run it. I ran the boat for over an hour at 3000-3200 and no issue. I did have it cut off once while I was at WOT for a few mins and I believe it’s because I out ran my fuel pump. Replacement pumps are no longer available, so I...
  3. M

    Engine dies after 40 minutes

    Update: This morning I got the boat on the muffs and let it run for 30 mins. While it was running I started a “wiggle test” on the wire harness starting at the dash with the tach. I noticed that the tach would “move” as I wiggled the wires, so I cleaned the connections and continued the wiggle...
  4. M

    Engine dies after 40 minutes

    Yea I had read that about the Thunderbolt IV and V ignition systems, that’s why I decided to replace the entire ignition system with a newer one. Problem is, the issue followed.
  5. M

    Engine dies after 40 minutes

    No it’s original wire, it’s molded in a rubber connector with the power and ground wire attached like a plug into the tach.
  6. M

    Engine dies after 40 minutes

    I got to looking around under the dash and found a wire that’s not on the factory wiring diagram that’s now confusing me. My tach wire at the tachometer is gray with a brown stripe. So now I’m wondering what’s between the tach and coil for them to change the color of the wire.
  7. M

    Engine dies after 40 minutes

    After much debate and thinking on this today, I’ve narrowed it down to this. The only common thing between the old ignition system and the new one, is the tach wire and the power wire. So I will eliminate the tach as an item to start with and if it still happens again, then the power wire is...
  8. M

    Engine dies after 40 minutes

    I like the test light idea, I could immediately see if I’ve lost power to the coil while sitting at the helm. I was going to use a voltmeter, but that’s a way better idea
  9. M

    Engine dies after 40 minutes

    I have made a jumper wire for the coil this morning with the same thinking. I have also found several loose connections in the engine bay with no affects on the issue. I have also studied the wiring diagram for the dash, and can only see that the tach might be the issue. I think it’s getting hot...
  10. M

    Engine dies after 40 minutes

    I’m going to disconnect the tach and replace the circut breaker this week and try that. If that’s not it, I’ll have to start tracing wires as there’s nothing left to cause the issue. It’s funny that it’s the same issue after 4 years with previous owner, now that I have it with everything I’ve done.
  11. M

    Engine dies after 40 minutes

    The carb was rebuilt with name brand parts. I don’t buy China unless I have to. I rebuilt the carb myself, 35 years as a mechanic
  12. M

    Engine dies after 40 minutes

    Yes it’s getting fuel as I’ve stated. Completely new fuel system and 6 psi at the carb. I have not pulled the plugs as they are new after the heads where replaced. Something in the electrical system is getting hot and either cutting power, or grounding out. I’ve done away with the Thunderbolt V...
  13. M

    Engine dies after 40 minutes

    The tank vent is not an issue, the engine shuts down no mater what rpms after 30-40 mins. It shuts down from 3000 or 4000 rpms, engine complete dies until it’s at an idle. This is not fuel related at all. It has fuel at the pump (6 psi), fuel in the carb, but will not take any throttle
  14. M

    Engine dies after 40 minutes

    It dies like the switch has been cut off. No spitting or sputtering like it’s out of fuel
  15. M

    Engine dies after 40 minutes

    It dies from 3000 rpm all the way down to an idle and runs fine, but will not take any throttle.
  16. M

    Engine dies after 40 minutes

    I have done these things and I’m getting 6 psi at the carb.
  17. M

    Engine dies after 40 minutes

    Hello, I’m having an issue with the boat dyeing after about 40 mins of use. Can not duplicate the issue on muffs. I’m the second owner of this boat and it’s new to me, the previous owner was chasing this same issue. It acts like the key is cut off while on plane at 3000 rpms, drops to an idle...
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