cdeverocks7
Cadet
- Joined
- Nov 22, 2011
- Messages
- 14
I've got a 1992 Mariner Thirty. It's a 2-stroke 30hp manual start motor running on pre-mix (no oil injection system on this motor). The engine fires right up and runs great but then dies after about 5-6 seconds. When I say dies it doesn't sputter it falls flat on it's face like someone hit the kill switch. However, if the motor is put in gear and started, quickly ran up into higher rpm range again it runs great with excellent throttle response etc. Once the throttle is brought back down to the lower rpm range the engine wants to fall on it's face again. If quickly revved back up it will come back to life but when brought back down it will die just like the kill switch was hit. I've been diagnosing this problem on my own cause I don't have a ton of money to pay a repair shop for diagnosing it and to buy parts.
So far I've rebuilt the fuel line from inside the tank to the motor including new filters, lines, bulb, fittings, etc. I've taken the carb off and apart and cleaned it (twice) and reset the float. I've replaced the spark plugs and taken the magneto off the top of the motor to inspect the stator and it's coils for any signs of damage to which there is no visual sign. The magneto and stator both look great. The CDI box also has no visual signs of damage aka heat damage or signs of electrical overheating.
I've been told by a local outboard mechanic that the problem is most likely my low speed coil and by another that the problem is probably the switch box. I can't buy a new stator but I can buy each individual coil. The stator has a lighting coil, ignition coil and pulser coil. Any idea which of these would translate to the low speed coil? Or would the problem more likely be in the CDI or "switch box"?
I'm stumped because I believe I've eliminated fuel as an issue and it gets spark to start the motor and run at high rpm's but it just falls on it face when you try to get an idle out of the engine.
Am I missing something?
So far I've rebuilt the fuel line from inside the tank to the motor including new filters, lines, bulb, fittings, etc. I've taken the carb off and apart and cleaned it (twice) and reset the float. I've replaced the spark plugs and taken the magneto off the top of the motor to inspect the stator and it's coils for any signs of damage to which there is no visual sign. The magneto and stator both look great. The CDI box also has no visual signs of damage aka heat damage or signs of electrical overheating.
I've been told by a local outboard mechanic that the problem is most likely my low speed coil and by another that the problem is probably the switch box. I can't buy a new stator but I can buy each individual coil. The stator has a lighting coil, ignition coil and pulser coil. Any idea which of these would translate to the low speed coil? Or would the problem more likely be in the CDI or "switch box"?
I'm stumped because I believe I've eliminated fuel as an issue and it gets spark to start the motor and run at high rpm's but it just falls on it face when you try to get an idle out of the engine.
Am I missing something?
