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  1. J

    Popping through carb at 4000 rpm

    Meant to ask where did you install the air fuel guage and where did you get it?
  2. J

    Popping through carb at 4000 rpm

    Where did you install it and. Het it?
  3. J

    Popping through carb at 4000 rpm

    I would think if fuel would happen across the rpm range. It runs great until the 4000 rpms range
  4. J

    Popping through carb at 4000 rpm

    I would think fuel but ..m Both motors old and new dis it around the same rpms.
  5. J

    Popping through carb at 4000 rpm

    It reacts the same way right around 4000 to 4200 rpm increases as rpms get to 4500
  6. J

    Popping through carb at 4000 rpm

    I posted before about this. I just replaced motor. Everything is new except fuel pump and intake manifold. It is a mercruiser 5.7 vortec carbed with a rochester 4 barrel. I transfered old carb replaced it. I transferred distributor with Hei and replaced that. No difference. The old motor popped...
  7. J

    New Motor same power issue

    Old block full of rust did not feel comfortable with it. Thought I would do it right..
  8. J

    New Motor same power issue

    I am leaning towards fuel. I purchased a new fuel pump and am going step by step to test things in fuel syatem
  9. J

    New Motor same power issue

    I do not know as it I purchased a long block complete.
  10. J

    New Motor same power issue

    Putting that on the list to check.
  11. J

    New Motor same power issue

  12. J

    New Motor same power issue

    Scott it is rebuilt vortec purchased from a reputable company. It has a carb. Those are things I will be checking this Friday when I go down.
  13. J

    New Motor same power issue

    Replace my 5,7 vortec with a rebuilt vortec. Block was rusted. When I get up to cruising speed, around 4000 rpms, it starts to pop through the carb. I have Rochester 4 barrel. The carb was replaced last year on old motor and i have a replaced one on this one also. Still pops through carb. I...
  14. J

    Rusted clogged cooling lines in the block 5.7 merc alpha 1 gen 2

    Manifolds and risers are clear it is just the block. The previous owner put new manifold and risers on he bought this engine used.
  15. J

    Rusted clogged cooling lines in the block 5.7 merc alpha 1 gen 2

    Yes it is a salt water boat. I will repower over winter. Trying to use it for season. It wasn't overheating on muffs and runs ok. Can I do this without removing drive it is an Alpha Drive so one hose for water supply.
  16. J

    Rusted clogged cooling lines in the block 5.7 merc alpha 1 gen 2

    I actually misunderstood the tech the blockages are in the block. He was telling me getting hotspots in the motor.
  17. J

    Rusted clogged cooling lines in the block 5.7 merc alpha 1 gen 2

    Water jacket not over heating on muffs actually runs good. But he replaced a head and noticed rust build up.
  18. J

    Rusted clogged cooling lines in the block 5.7 merc alpha 1 gen 2

    I was told my cooling lines are rusted and some are clogged. How can I clear these lines without removing the motor? Can I flush with acid?
  19. J

    Boat breaks up whil on plane

    I have a mercruiser 454 bravo one. A rebuilt rochester 4 barrell. I was out today cruising when the boat all of the sudden felt like it would start to break up then it would bog down and finally stall. It would become very difficult to start and all of the sudden would start up run rough and...
  20. J

    454 merc bad gas maybe?

    My boat was laid up for thee years. I finally got it out. It stalled on me and could not get it started. I was towed in and replaced the water seperator and noticed a lot of floating debris. I have been putting 30 to 40 gallons of gas in each trip with fuel system cleaner. Do you think this will...
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