Strange problem with my motor started happening recently...
After running at or near full throttle for a while, when I get off plane and put the engine in neutral the engine will rev on it's own from idle speed (900-1000 rpm) to up over 2500 rpm sometimes. It only happens after running for a while at 4000+rpm. Does not do this if I stay off plane and dont bring the revs too high.
If I leave the boat in gear at idle speed the RPM's will stay low at regular idle speed, but if I take the motor out of gear the revs will build up quickly. IF I let it sit in neutral for 5 mins or so the revs will go back down to regular idle speed.
This is a real problem when I am trying to drop anchor or when I am trying to dock the boat because the engine revs high in neutral so when I try to throw the engine in gear it really clunks, and I'm starting to worry about the gear linkage and gears themselves.
The motor also stalls out sometimes if I advance the throttle too fast, like there is a dead spot around 3500 rpm or so. I cannot just slam the throttle to full throttle from idle speed or it will stall out....I have to slowly advance the throttle until I am on plane and then I can put it to full throttle. I'm thinking this may be related to the idle revving issue, like there is a vaccuum leak somewhere or something?
Any ideas on either of these issues?