Hello guys. Weird stuff going on on my 2002 115 4 stroke motor. Can't achieve above 4700 rpm ( still same old prop) .Takes everything to get on step. And when engine gets warm and i come off step can't get past 8-9 mph and thats with throtle all out.after a 15-20 min like this it gains 100 rpm here and there and eventualy gets back on step but very gutless and still miles away from 5000-6000 rpm. changed the fuel filter and it still does it plus there is no water in fuel. ( my kicker works fine) . On a crazy note if i press the throtle botton on lever i can rev the engine up to roughly 5200 but sounds like a rev limiter kicks in. Also i can get more rev in reverse i'm baffle Any ideals ??? Been reading about the VST filter and know for a fact that it has never touched, I run only fresh water if that makes a difference. Thanks a million Frank