This engine is now giving me a pain in the nuts!!!!
After checking all the water passages yesterday, I replaced the water flow senor and took the boat out today around Howth (Dublin).
She ran great, even in pretty choppy weather - cruising at 35kmph. We ran around for approx 2hrs - We went up the coast then back with no issues. UNTIL we went into Malahide Marina for a nosey at all the boats. We cruised around at between displacement speed to approx 2,500rpm. We came out and powered up to cruising speed - after 20-30secs the engine cut back to 4,500prm and would not rev anymore (there were no warning lights or buzzers).
I turned for Howth harbour and she cruised back at 4,500rpm doing approx 28kmph - it took 10mins to get back to the harbour.
The engine ran at this 4,500rpm for 10mins without missing a beat but wouldn't rev into it's power band of 5000-5500rpm.
When the throttle was pushed forward it did nothing.
To Date I've changed - Fuel filter, plugs, Oil flow sensor, Water flow sensor and Checked functionality of Thermostat and overheat sensor.
I've checked all wiring on motor, and added a water/fuel separator filter.
This is the same issue I've had since the start - Where do I go from now??? PLEASE HELP.