I was going to say clogged fuel filter because that was the cause of most of any sudden no-rev or low power problems I have encountered in the past, but they never spontaneously solved themselves like in your situation.
Is it temperature related?
Doubt adding 2-stroke oil to the tank will solve this for you.
The fuel shutoff solenoid rarely fails so try some easier things first.
Splice in a section of clear fuel hose in the return line from the IP to watch for air bubbles. That may give you a clue that air is entering the fuel supply, which can limit revs and power.
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1985 744 gle d24t
1985 745 gle d24t
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