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  1. J

    Another blown head gasket - Fuel Mixture?

    Thanks. As soon as I install the head back, I'll find another tach and run it parallel with mine...I hope that explains why I thought I was doing 5500.
  2. J

    Another blown head gasket - Fuel Mixture?

    I don't understand. What's wrong with running a 14.25/21 on a 3.0?
  3. J

    Another blown head gasket - Fuel Mixture?

    Forgot to mention...it runs a 21 pitch prop.
  4. J

    Another blown head gasket - Fuel Mixture?

    I don't know. It's been the same since I bought the engine. Never had to adjust it...as said the engine always ran "perfect". How do I check that?
  5. J

    Another blown head gasket - Fuel Mixture?

    Thanks for the tip. I thought the WOT was 5800. In any case I've brought it to that speed maybe twice in perfect mirror lake conditions. I normally cruise at 4500 max. So you don't think the fuel mixture caused it? I'll look for those bolts
  6. J

    Another blown head gasket - Fuel Mixture?

    Hey folks, I searched around but didn't find the answer to my specific question. I/O: Merc 3.0 4L (1998) - Alpha one Gen 1 Boat: Cadorette Nuova 170 I replaced my engine with a used one about 3 years ago. The used engine had blown the head gasket, so I replaced it. I have put about 60 hours...
  7. J

    Proper way to wire a kill switch on Thunderbolt IV

    I think mine is 12. Based on the chart it would be 10A @ 4.6 meters... which seems low for the ignition plus instruments.
  8. J

    Proper way to wire a kill switch on Thunderbolt IV

    Thanks. They seem difficult to find. I found a 12 amp kill switch...nothing above.
  9. J

    Proper way to wire a kill switch on Thunderbolt IV

    Thanks but that's not my question. My question is whether a 5 amp rated kill switch would withstand the current drawn by the engine and instruments.
  10. J

    Proper way to wire a kill switch on Thunderbolt IV

    It's an I/O Merc 3.0 (140HP)
  11. J

    Proper way to wire a kill switch on Thunderbolt IV

    It's an I/O Merc 3.0 (140HP)
  12. J

    Proper way to wire a kill switch on Thunderbolt IV

    Hi Folks, I just asked this question on another thread but since this is newer, though I'd have better chances of getting help. The question is about the kill switch installation on the purple wire. I noticed the Purple cable (ignition) is as thick as the Red (battery) which seems to suggest...
  13. J

    Installing kill switch

    Hi All, sorry for reviving this old thread. In this post, I found most of the answers to my questions about Kill Switch installation except one which the OP asked but never got a replied for. "I was wondering if the switch is capable of carrying enough current to handle cutting all of the...
  14. J

    Another cracked block?

    Hi Folks, a newbie here. I read every possible thread and youtube videos I could before posting my question here. It seems there isn't a straight answer for it, but many "it depends". I just bought an As-Is 17-footer (1990 bowrider, I/O 3.0 GM 4Cyl 140 Alpha One, Engine is 1986, I think)...
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