Racerone, Sorry let me clarify the fast idle pump. I do it after the motor has started. Kind of like reving the engine in a hot rod! Just knocking the cobwebs out!!! Do you know of a bench test that will diagnose a high rpm short in the power pack? Or am I hanging off the transom with a timing light like fastbullet suggests?Pumping the fast idle lever is a waste of effort.-----It does nothing.------Push key in and hold it in while cranking it over for cold starting.
The alarm works and yes I replaced the water pump this last June. While on the muffs I'm able to keep a hand on the exhaust plate, Its hot just not hot enough to burn you. I know that's not very technical but I don't have an infrared thermometer. Again both poppets, springs and thermostat were replaced last month. Here are my symptoms again, The motor starts easily, auto choke works perfectly. While underway mid range I have a little shutter or vibration and at full throttle 5100 RPMs it will run perfectly and like a light switch it drops RPM's after about 15/20 seconds to 2500 to 3000. After backing off to neutral I can repeat this problem over and over again. While cleaning the carbs this last time (not finished yet) I found something stuck in one of the low idle jets. Probably a piece of fuel line. I've replaced everything from tank to carbs and added an inline filter.Do you have a functioning overheat alarm? Sounds like an oveheating situation. When was the waterpump or impeller last replaced?