Can annybody help with this one. She starts up easily, idels perfest , revs perfect

BUT

As soon as you put it under loads she runs for about 2 miles and then looses 1/2 throttle.

PSE HELP

Could be a fuel issue. I would start with a warm compression test, then inspect all your fuel lines. Old mercury fuel lines are know for delaminating from the inside out, So be thorow.

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My 60 4stroke fuel inj had similar problem-fuel lines bad on
inside,replaced and also found the mechanical fuel pump to
be unable to provide sufficient fuel under load-replaced pump
and problem solved.