Serial # - 2B123542
2015 mercury pro xs 250 2 stroke
Apologize up front for the long winded post but want to include all the details. A week ago I took my boat out and every time I cranked the motor the rpm’s would rise above usual at start up and then drop back down to normal idle throughout the course of the day.
The next day, it was doing the same as mentioned above. After fishing all day I ran it back and set it down at the no wake zone and it stalled. Upon firing it back up, it would surge at idle (idle rough for a few minutes then raise rpm’s, and repeat).
Researching, I thought I might of had a bad diaphragm in the fuel rail so I purchased all 3 new and the tool and replaced them. The tracker valve did have a slight tear but upon replacement there was no change. I also replaced the spark plugs (correct plugs and gapped correctly), and a new water separator filter. The spark plugs were pretty black. With still no change.
I did perform the test to see if there was any fuel on the air side or air in the fuel side by pressing in the shraeder valves and it didn’t appear there was any. I purchased a gauge to see if I could see the pressures but it wasn’t a liquid filled gauge and it jumped so bad I couldn’t make out what pressures it was operating at. It did increase pressure as the rpm’s surged.
there are no mechanics anywhere close to my location and anyone I have called is booked way out so any assistance would be appreciated.
I have heard it could be the TPS, reeds, air compressor, plug wire, coil but just wondering if anyone could try to narrow this down.
thanks in advance.
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