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  1. nola mike

    Very loud "thunk" while underway...

    '03 25hp 2 stroke merc (no s/n handy, sorry). Cruising today at 3/4 throttle, no problems, and I hear a very loud "thunk" sound, and motor starts to rev. I immediately pulled off the throttle and went to neutral. Engine sounded fine. Shifted into fwd/neutral/fwd. No problems. Went slow for a...
  2. nola mike

    OMC to Merc swap in 1996 Sundowner 195

    Hammer test is lousy. Drilling some holes in tension and stringer imo it's the only fool proof way to test condition. Everything is accessible with the engine out, and definitely worth doing to make certain you're not putting lipstick on a pig
  3. nola mike

    Boat starts perfect but shuts off after 20 mins of driving

    The point was that carp in the tank can be causing your issues, and if you had debris in the carb filter it's probably in the carb. Assuming you don't have a water/fuel filter. As for this miracle fuel cleaner, please share with us--especially any proof of efficacy. How did you check for water...
  4. nola mike

    Audio warning system on 2003 Mercruiser 5.0

    that's what I'm saying. switch polarity is reversed between TB iv and v
  5. nola mike

    Audio warning system on 2003 Mercruiser 5.0

    so this has come up a few times lately.... the tks/tbv system looks different than the TB iv in terms of the alarm system. all of the alarms go through the icm in tbv, and the op switch for the warning is NC with engine running. unless I'm reading things wrong. otherwise all of the recent...
  6. nola mike

    OMC to Merc swap in 1996 Sundowner 195

    If you can find a wiring diagram of the boat harness and post it here you'll get a better answer. Better yet, diagram of both harnesses.
  7. nola mike

    2007 Merc 5.0 TKS stalled at speed, had to be towed

    Fyi, looks like the tks switch may be different. I can't link ATM, but manual #41 has 2 switches (which one are we talking about?). It appears that the 2nd switch is different than the warning switch on the older models. And like I said above, this switch feeds the icm whereas the older ones didn't
  8. nola mike

    Thunderbolt V vs Delco EST Ignition

    Also, tb v has a dynamic advance feature based on rpm (potentially allowing more advance). I think the Delco is just a static advance map
  9. nola mike

    Bad engine coupler or spun prop hub?

    That should be fine
  10. nola mike

    2000 Alpha One Gen 2, U-Joint Knocking

    did you check your alignment?
  11. nola mike

    Exhaust leak from lower unit?

    Yes
  12. nola mike

    Engine starts, idles for 10 seconds then dies

    Yeah, not sure why the effort wouldn't go towards fixing the flooding carb first
  13. nola mike

    F-150 Transmission Issues (I think? . . . No, I thought )

    Man, all this ford bashing. Jealous of that fix. My mini is/(was?) throwing insufficient boost pressure codes. Wastegate and diverter valve (as well as the turbo itself) are common culprits. To inspect the wastegate, I need to remove the exhaust and cat (that should be fun). If it needs...
  14. nola mike

    Popping through carb at 4000 rpm

    AEM 30-0300 X-Series Wideband UEGO AFR Sensor Controller Gauge https://a.co/d/cS98SEW Hardin Marine has the spacer
  15. nola mike

    Popping through carb at 4000 rpm

    they make a spacer that sits on top of the exhaust manifold. dunno what the rest of the question was
  16. nola mike

    Popping through carb at 4000 rpm

    you need more fuel with higher rpms, so not really. secondaries opening? fwiw, I absolutely love my a/f gauge that I installed. takes all of the guess work out of the equation as to whether/when you run rich/lean
  17. nola mike

    Throttle spring on 1981 Mercruiser 120. Courting disaster

    What carb do you have? How is the throttle opening with the cable holding it closed?
  18. nola mike

    Antifreeze Question

    nope, you're right. quick mods, close the thread!
  19. nola mike

    1990 vs 1992 4.3 block swap

    did you check the water pocket cover in your outdrive?
  20. nola mike

    New boat with merc 5.7

    oh, shift interrupt switch.
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