If the rings are completely worn out they can put more preasure in the crankcase than the pcv can handle. Have it checked out.
All four-stroke engines have crankcase back pressure because gases blow by the piston rings. They used to just drill a hole in the crankcase to let it out; when the government figured out this was a major source of pollution, they required the gases be captured and burned. To make this work, the hole is fitted with a one-way check valve and a hose. The hose is routed to the air intake on the carb or fuel injection. This is called "positive crankcase ventilation" (or "PCV") because the intake system's vacuum sucks the gases out of the crankcase. The valve is there for safety reasons: if the engine backfires through the carb, the PCV valve keeps your engine from exploding - which happened before the PCV system was invented. If you're getting back pressure, this system isn't working. And the problem's usually that the PCV valve is clogged or stuck shut. They should be replaced every year at the start of boating season, but since yours is clogged replace it now. If you pay $10 for one you went to a really expensive store.
Don't take my answer for the real thing. From my understanding, those 2.0S motors (carbs) have many pressure and vacuum lines going to AND from the motor. If for any reason, there is a break in any of the lines, the motor will not function properly. in this case, when you stab the gas and hold it, the motor needs to build up pressure in order to increase RMP's. My suggestion, check your vacuum lines.
Some of the air handling dampener motors are vacuum controlled and some have a small electric motor. If it's a vacuum controlled dampener, you probably have a vacuum leak, faulty vacuum diaphragm or disconnected vacuum line. If it's an electric dampener motor you have a bad connection, faulty feedback switch or faulty motor assembly.
I'm having the same problem. What seems to be happening with my filter system is the motor itself is more powerful than the vacuum hose can suck, the motor gets starved for water and loses pressure. I try to compensate for this by placing the 'dish-lid-thingy' (sorry I don't know the actual name) a little askew. If I can get this just right, what the motor is unable to suck thru the hose, it can also suck in thru that sliver of a gap the the skimmer box.
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