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1976 merc 7.5hp with a weird issue

Jetwilson

New member
so ive got a strange issue, i recently rebuilt my 7.5 that i bought off of FB, one of the pistons was stuck, but was able to revive this engine and it runs great i put all new seals, rebuilt carb and fuel pump, water pump and it starts and runs in neutral and reverse full throttle no problem, but once i put it in forward it only goes half throttle even at the tiller and stater full throttle out on the lake, even when i have it at home in a can full of water with no "load" on it, it wont go full throttle, but it will go full throttle full rpms in forward when not in water, and obviously i dont run it out of the water but a couple secs. i have tried everything i know to do and i cant figure it out. What do you guys think
 
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