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  1. M

    Mercury 500 1970 low spark

    I have a mercury 500 that was running great. Was cleaning the old boat up so decide to clean motor to big mistake run better dirty. Well got to river motor started and run good for bout 30 second v while warming up. Since then I have got it to hit a lick or 2 but will not run drain bowls on...
  2. M

    1970 mercury 500 thunderbolt help

    Well I am having trouble everyone I go to river to fish. It has run good couple times. This is what I have done. I have replaced fuel pump throttle cable new ngk plugs. I have checked spark and getting 7/16 bright blue spark on all for cylinders check compression 130 to 135 on all for...
  3. M

    Throttle and shift cables help

    I need to know which ones i need to buy model #2740126 mercury 500 thunderbolt. What year model is this motor also got 2 levers. A warm up levwr and shift lever. White control box if ya need any more info let me know.
  4. M

    help with finding prop

    I have a 1969 mercury 500 thunderbolt serial number 2740126 I am needing a prop for it not sure what pitch or anything Cant find a number on the prop itself any help would be appreciated
  5. M

    mercury 500 thunderbolt help

    I got a 1970 mercury 500 that was running good and for some old reason today it messed up. I was going cross lake and all the sudden it was like I hit a log. I looked and there was nothing around but I can idle and it goes good but when I throttle it up to plane it act like the prop is not...
  6. M

    help mercury 500

    Going to buy another mercury 500. Guy say that it will start fine on hose but when put in water it will not start any ideals on this
  7. M

    mercury 500 fuel help

    What is best oil fuel mixture for a 1970 mercury 500 motor. Right now I am mixing 50 to 1 .
  8. M

    50 hp thunderbolt help

    Re: 50 hp thunderbolt help Well worked on motor today after couple hours I got it to hit a lick I had to add new fuel lines to it. The last time this boat was registered was back in 2002 so the motor probably has run since before then. Threw some gas to it and fired right up Idle real...
  9. M

    50 hp thunderbolt help

    Re: 50 hp thunderbolt help The blue arrow is point to a part I need one off these what is it
  10. M

    50 hp thunderbolt help

    Re: 50 hp thunderbolt help I order it from Crowley after that just got to get it to throw some water Got another ? Is this the right wiring diagram
  11. M

    50 hp thunderbolt help

    Re: 50 hp thunderbolt help I looked on the website for wiring harness but it don't look like it the right one I think it suppose to be 7 plug but guy said this is the one it calls for. Just want to no for sure before I order it. This what my plug from controls look like
  12. M

    50 hp thunderbolt help

    I bout a 50 hp thunderbolt today and was wondering if they are good motors I got a 17 aluminum boat It is a 97 life guard boat I was wondering if it would be a good motor to out some money into to put on this boat I don't know what year it is but the serial # is 2740126 It is going to need...
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