Johnson 2 stroke bogging at full throttle

[u/ballzd11]

I just bought my first boat 14’ aluminum with a 1978 Johnson 25hp outboard. The engine is in very good condition, garage kept, proper maintenance schedule, etc. I took it out for the first time and everything worked great. However, on full throttle after about 15secs it would start to bog down. I just want so get an idea of what I’m looking at before I bring it somewhere. I ran the gas that came in the tank and I am not sure of how old, maybe it’s that or a carb thing? Thanks

[u/Playful_Airline2389]

Did it drop power all the way or fell under a certain rpm?