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  1. M

    How to find the gear ratio

    Greetings, I have twin 1997 4.3ltr mercruiser motors with Alfa1 genII outdrives. the port side has a crack in the outdrive case, so I need to replace it. I'm not sure which gear ratio I have. Any help would be great, Thanks.
  2. M

    Mercruiser 4.3 low oil pressure.

    I took my boat out on a shakedown cruise. The Starboard engine is a 2009 4.3 carb motor. It always read a constant 40psi, but today was different. After an hour of use, the alarm went on and oil pressure dropped near zero. I shut the motor down for 15 minutes and then restarted it. I got 25psi @...
  3. M

    v6 motor hesitates between 2000 - 3500 rpm

    Boat was dry docked for two years. When stored, the gas was mixed with fuel stabilizer. I have twin 4.3 engines. The port engine doesn't run as it should. It really hesitates between 2000-3500rpm. It stalls if I don't fan the throttle. Idle is good and over 3500rpm is good. So what do you folks...
  4. M

    Power trim not going up on port engine??

    Boat was dry docked for two years. Trim won't go up on port engine when pushing the trim switch. I could hear the solenoid click, but that's about it. I climbed down into the engine bay and jumped the solenoid and the outdrive went up with no problem. Any idea's b4 I take things apart???
  5. M

    Switched from a three blade to a four blade.

    Greetings All, On my 29' Larson twin 4.3ltr, I switched from twin SS mercury 3 blade 19P x 14-1/4 props to twin Solas Amita Aluminum 4 blade 17P x 14-1/2" props. NIGHT & DAY IS ALL I CAN SAY!!! Planes so much quicker, I don't even use my trim tabs anymore. Also it's faster out of the hole...
  6. M

    Harmonic Balancer Replacement

    Greetings All, I have to change the Harmonic Balancer on my 4.3 V6 port engine. I've done it a few times on various cars that I owned and I own a puller and installer. Other then removing the starter and jaming a prybar into the flywheel, is there another way of keeping the crank from...
  7. M

    Windless repair, please read

    Greetings all, Just want to share some good info. I have a horizon/simpson 500 windless on my 1997 29' I/O Larson. I was having trouble with the 12v motor operation last season. Over the winter I took it apart and I could see the motor was a mess from the years salt water operation. A...
  8. M

    Water temp sending unit not working

    Greetings to all who always helps me and saves me money in expensive repairs. My water temp gauge is showing zero. I took off the sending unit wire and put it to ground. The gauge pinned. I took the old sending unit to the marine parts store and told them to match it up for a 4.3 v6 mercruiser...
  9. M

    Interior Headliner

    Does anyone know a reliable person or place that replaces headliners on Long Island. I have a 29' Larson Cabrio and after 10 years the headliner is sagging and discolored. So time to change it. I'm sure it's not cheap.
  10. M

    mercruiser outdrive noise

    :( Greetings, I have a 99 Bayliner with a 5.7 mercruiser and Alpha one/ gen II stern drive. When the boat is in gear, I hear a a clattering noise coming from the back of the boat. it doesn't matter if I'm going straight or turning. Before you answer that question, I'll give you the history what...
  11. M

    Mercruiser 5.7 Loss of Power

    Greetings, I have a 1999 Bayliner with a 5.7 mercruiser 250hp that I can't figure out the problem. It started in the begining of this boating season. It was running crappy and stalling. First thing I did was change the water filter and put in water zorb in the tank. This solved the stalling...
  12. M

    No speed with a twin mercruiser i/o v6's

    Greetings, I purchased a used 1997 Larson 29' Cabrio boat with new 2008 engines. The drives are Alpha 1/ Gen II The engines run excellent, but the boat doesn't go faster then 10 mph. It seems past 2500 the props seem to cavitate or spin out. I even tried one engine at a time and...
  13. M

    power trim mercruiser

    Greetings, if anyone can help me with my power trim problem there would be a huge weight off my shoulders. I have a 97 Larson 29' with twin I/O V6. In my driveway the trim worked fine. Since I last trimed it, I put in a new GPS and VHF. When it came to launching the boat, the trim would not go...
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