Fletcha221
Recruit
- Joined
- Nov 20, 2020
- Messages
- 4
Started this under another thread where I was certain I had a bad stator, unfortunately, that's not the issue. My mechanic seems to think the flywheel has gone bad (apparently magnets are glued into the flywheel? He seems to think one magnet came loose? If you read below, I THINK its the last logical thing that could be causing the issue.
Has anyone experienced this?
When we broke down, running at 4k rpm, engine just stopped. There was no poor running, just stopped like someone turned the key to "off".
When starting from "cold" the motor comes to life for a split second (sometimes) and hunts around and stalls. It wont stay running. All cylinders have spark (but I'm guessing the timing is off or the spark is weak), all cylinders have equal PSI. There is fuel, and all floats in the carbs are working correctly.
The house systems on the boat are 100 percent mutually exclusive from the engine (Besides the 12v key wire powering the Gauges , I have completely removed the neutral safety switch, and replaced the key switch.
The batteries are good, all grounds and hot leads are clean and secure. (cleaned and retightened). The ground straps for the ECU are clean and tight as well. I pulled a gallon of fuel, there is no water in the fuel. All coils are tested. Carbs have been rebuilt, and did a link and sync on the carbs and I have replaced the following:
1. Crank position sensor (correctly gapped to factory spec)
2. NOS matching CDM (ECU)
3. Tested used stator
4. Mercury Key switch (Ignition)
5. Starter Solenoid
6. Starter
7. Plugs
8. Fuel Pump
It has fuel, spark, and compression......it just wont run. Just sputters, hunts around in RPM then dies, within 5-10 seconds.
I seriously can't think of anything else that could be wrong with the motor, besides it being a Mercury
HELP!!!!!
Has anyone experienced this?
When we broke down, running at 4k rpm, engine just stopped. There was no poor running, just stopped like someone turned the key to "off".
When starting from "cold" the motor comes to life for a split second (sometimes) and hunts around and stalls. It wont stay running. All cylinders have spark (but I'm guessing the timing is off or the spark is weak), all cylinders have equal PSI. There is fuel, and all floats in the carbs are working correctly.
The house systems on the boat are 100 percent mutually exclusive from the engine (Besides the 12v key wire powering the Gauges , I have completely removed the neutral safety switch, and replaced the key switch.
The batteries are good, all grounds and hot leads are clean and secure. (cleaned and retightened). The ground straps for the ECU are clean and tight as well. I pulled a gallon of fuel, there is no water in the fuel. All coils are tested. Carbs have been rebuilt, and did a link and sync on the carbs and I have replaced the following:
1. Crank position sensor (correctly gapped to factory spec)
2. NOS matching CDM (ECU)
3. Tested used stator
4. Mercury Key switch (Ignition)
5. Starter Solenoid
6. Starter
7. Plugs
8. Fuel Pump
It has fuel, spark, and compression......it just wont run. Just sputters, hunts around in RPM then dies, within 5-10 seconds.
I seriously can't think of anything else that could be wrong with the motor, besides it being a Mercury
HELP!!!!!
