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Help!! 2000 25 HP Yamaha 4 Stroke Issue - Cuts Power
2000 25 HP Yamaha 4 Stroke – F25ELHY
Manufacturer December 1999
Problem: Initially the motor starts and runs perfectly. After it warms up and it starts cutting down on the power. I back off the throttle and it continues to run, any attempt to increase and it wants to kill. One time I had the throttle full open and it ended up killing the motor, engine flooded. Timing of the event is very erratic.
After talking to a few technicians. Decided to attempt a few items myself before bringing it in.
Replaced: Fuel - Fuel Line – Gas Tank – Gas Filter
Friend attempted to troubleshoot – former Marine Mechanic:
Connected up a fuel tank (source) and gravity fed gas directly to the carburetor. Issue still exists.
It has been to 3 repair shops, 2 of them are Yamaha dealers - Attempted by the repair shops:
Carburetor Cleaned
New Fuel Pump
New Computer
Engine is not overheating.
Additional Background: The issue seemed to appear after I had to remove the motor from the boat. Ended up laying the motor horizontally. I did lay it on the correct side.
Opinion: Based on the way it is acting, it seems more electrical. I am thinking of trying the Thermo Switch. Apparently the job of the switch is to drop the RPM’s down to protect the engine. I and the shops have verified it is not overheating when the issue arises.
This issue has been going on now for close to 2 years. I am getting very frustrated… If anyone has any ideas or opinions. Maybe any additional resources. I would GREATLY appreciate any HELP.
Thank You!!
Sincerely, Bob
2000 25 HP Yamaha 4 Stroke – F25ELHY
Manufacturer December 1999
Problem: Initially the motor starts and runs perfectly. After it warms up and it starts cutting down on the power. I back off the throttle and it continues to run, any attempt to increase and it wants to kill. One time I had the throttle full open and it ended up killing the motor, engine flooded. Timing of the event is very erratic.
After talking to a few technicians. Decided to attempt a few items myself before bringing it in.
Replaced: Fuel - Fuel Line – Gas Tank – Gas Filter
Friend attempted to troubleshoot – former Marine Mechanic:
Connected up a fuel tank (source) and gravity fed gas directly to the carburetor. Issue still exists.
It has been to 3 repair shops, 2 of them are Yamaha dealers - Attempted by the repair shops:
Carburetor Cleaned
New Fuel Pump
New Computer
Engine is not overheating.
Additional Background: The issue seemed to appear after I had to remove the motor from the boat. Ended up laying the motor horizontally. I did lay it on the correct side.
Opinion: Based on the way it is acting, it seems more electrical. I am thinking of trying the Thermo Switch. Apparently the job of the switch is to drop the RPM’s down to protect the engine. I and the shops have verified it is not overheating when the issue arises.
This issue has been going on now for close to 2 years. I am getting very frustrated… If anyone has any ideas or opinions. Maybe any additional resources. I would GREATLY appreciate any HELP.
Thank You!!
Sincerely, Bob
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