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  1. J

    motor problems

    I had a few days on the boat and developed motor problems. I have a 1986 Larson 21 ft with a mercuiser MCM 228 engine SS# 4930867. I have a Holley 4 bbl carb on it. I have been having problems with the rpms. I used to get about 3200, which is low, this weekend I could only get 2200-2500. On...
  2. J

    need advice before I really mess things up

    I went to put in my new thermostat. the bolts came out with no problems. I put the thermostat in and tried the motor. The one gasket leaks so I went to take it apart again. The one bolt broke about 1/2 inch about the engine block. It did not feel like it cross threaded or was over tight...
  3. J

    thermostat question

    I have a merc. MCM228 serial # 4930267. I found that there was no thermostat in the engine. I have everything to put on in. Does it go in the upper housing where the hoses connect or does it go in the housing at the engine block. The bolts that hold the housing holds both places to the...
  4. J

    slow shifting

    I have a 1986 Larson with a mercurser MCM 228 motor. I recently had problems with it stalling when coming out of reverse. I took it to the shop and repaired it. On the second time out I started having some problems. It no longer stalls coming out of reverse but I had a lag in shifting out of...
  5. J

    Temp gauge and sender unit

    I am replacing my temp. sending unit and thermostat in my boat. I have a 1986 Larson with a 228 MCM Mercruiser engine. The engine serial # is 4830267. How can I tell what type of sending unit I have? I might also change my gauge. It appears that I am not getting a good reading on my engine...
  6. J

    Cleaning Gas Tank

    When I was working on getting my boat ready for the water I looked inside the gas tank. I had some sediment and sludge in the bottom of the tank. I pumped the fuel out. I have about 2 ounces or so left in the bottom of the tank that I can't get out. It has a little bit of mess left in it...
  7. J

    How do I test my shift interupter (kill) Switch?

    I have a 1986 Larson with a mcm228 mercruiser. Last summer I was having problems, when I was shifting from reverse to neutral the motor will stall instantly. There was no sputter. Is there a way to test the switch or should I just replace it? thanks John
  8. J

    exhaust bellow

    I have a 1986 mercursier with a 230 hp motor. The rubber exhaust bellow between the transon and outdrive is cracked. How hard is this to replace and can it be done without removing the outdrive? Thanks
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