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    1989 merc crusier 350

    I have a 1989 irvette with a 350 mercruiser inboard. It has the mercruiser thunder bolt iv system. When everything gets hot (not over heating) after running for about 15 mins i lose power and you can hear popping thru the carb. I have rebuilt the carb and replaced the ign coil. and set timing...
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    not sure what i have

    Re: not sure what i have
  3. B

    not sure what i have

    I have a mercury outboard it is labeled 7.5 but the water pump I had to get is for a 20 hp, the serial number is 4354934 and it says thunder bolt ign. on the cover. I got the motor for free and trying to get it going. back in the 1970's in Maryland if it was under a certain hp it didn't have to...
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