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  1. C

    hotter plugs ?

    I have a '84 Merc 7.5 that runs great but tends to foul the plugs. Would hotter plugs eliminate this and if so, does anyone know of some brands and numbers. Standard plugs for this model is a Champion L77JC4 or NGK B9HS-10. Fuel is mixed 50:1 with quicksilver oil. Thank you.
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    cleaning cylinders ????

    I have a '84 Mercury 7.5 that seems to be in tip top condition until you look into the cylinders thru the spark plug holes. The engine runs great but tends to foul plugs during short runs. Is there some way I can clean these? (perhaps an engine treatment of some kind) The motor had set up for...
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    proper fuel/oil mixture (old rude)

    a buddy of mine borrowed his dad's '59 model Evinrude 10hp. is a 50 to 1 mixture ok? also the engine doesn't run well at wide open. after a few seconds it surges as if you were cranking the throttle from idle back to wide open, over and over. we replaced the fuel line and primer bulb...
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    determining model# and year

    could someone help me figure out the model# and year of a particular mercury 7.5hp outboard with serial# 6506404<br /> thank you
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