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    1974 650 65hp fuel pump issue

    hello everyone, this is my fuel pump issue ,just the other day we were cruising wot for about 2hrs straight up and down the fox river when I lost rpms and motor started bogging and very sluggish so I squeezed bulb and a little bit change in rpm but not much so got home checked fuel filter & ok...
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    1974 650 thunderbolt 65hp need help lost wot power

    was out on lake today doing wot at 5000 rpms and suddenly lost plane and power but would idle fine but boat will not get up on plane now so took boat back home & checked plugs and found that all plugs had a little bit of oil on them so I assumed that maybe I fouled out a plug or two so I changed...
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    1974 mercury thunderbolt 650 65hp good & bad

    is this a reliable motor for it's age? or I'm I in for empty pockets
  4. I

    temp gauge

    I have a mercury 650 thunderbolt sn# 3810608 and is there a way I can install a temp gauge?
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    spark plugs

    what is the different between ngk buhw & buhw-2?
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    1974 mercury 650 thunderbolt prop?

    I have a 1978 starcraft super sport open bow with a 1974 sn#3810608 mercury 650 thunderbolt 65hp and I would like to get the fastest speed so what would be the best prop to achieve this (pitch, dia,aluminum,stainless steal)?????
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