trophypro2302
Recruit
- Joined
- Jul 27, 2018
- Messages
- 4
Hello All,
Currently my baby is running a little below spec. She runs, starts and idles great until I need to open her up. A 2002 Mercury 200 EFI 2 Stroke should run at about 5000-5500 RPM at WOT. The way she sits, she will run at about 4200 RPM at WOT under load. If i put her in neutral, she will rev to spec. I have cleaned and replaced spark plugs and she runs better and increases RPM at WOT, but after a little while its back to 4200 RPM. In some cases i have come back from offshore fishing trips and she wont even plane out. Once again, i clean the plugs, and tried a little mercury quickleen and she runs good for bit then back to the same thing. The merc is bolted to a 2302 Trophy Pro and has a 15 3/4" x 15 pitch mercury mirage prop. This is the stock prop size, so i dont believe that she is over propped. I have replaced the following, some to try and correct the problem, some just as routine maintenance:
-Spark plug wires
-Spark Plugs
-Primer bulb and lines
-Water fuel separator filter and housing
-Impeller
-Thermostats
I plan on doing a couple more things before i take it to the dealer. It seems like there is excessive oil on the plugs when i clean them. I am starting to suspect it is "pulse pump" that draws the fuel from the tank. Sometimes the primer bulb isnt exactly as hard as it should be. If I let the boat sit for a week or so, the primer bulb is soft and i have to pump it to get hard again before i start it. I have tested the fuel pressure in the VST and its at 40 psi, where I think it should be. I am starting to think that those check valves are bad and the pistons on the down stroke are forcing the fuel pressure back towards the tank. I am pretty mechanically inclined and feel like i can fix whatever the issue is myself, my problem has been the diagnosis of the problem. Has anyone experienced these symptoms and come up with a solution? I feel like I should just take it to the dealer before i replace everything. It might be cheaper.
Thanks in advance.
Currently my baby is running a little below spec. She runs, starts and idles great until I need to open her up. A 2002 Mercury 200 EFI 2 Stroke should run at about 5000-5500 RPM at WOT. The way she sits, she will run at about 4200 RPM at WOT under load. If i put her in neutral, she will rev to spec. I have cleaned and replaced spark plugs and she runs better and increases RPM at WOT, but after a little while its back to 4200 RPM. In some cases i have come back from offshore fishing trips and she wont even plane out. Once again, i clean the plugs, and tried a little mercury quickleen and she runs good for bit then back to the same thing. The merc is bolted to a 2302 Trophy Pro and has a 15 3/4" x 15 pitch mercury mirage prop. This is the stock prop size, so i dont believe that she is over propped. I have replaced the following, some to try and correct the problem, some just as routine maintenance:
-Spark plug wires
-Spark Plugs
-Primer bulb and lines
-Water fuel separator filter and housing
-Impeller
-Thermostats
I plan on doing a couple more things before i take it to the dealer. It seems like there is excessive oil on the plugs when i clean them. I am starting to suspect it is "pulse pump" that draws the fuel from the tank. Sometimes the primer bulb isnt exactly as hard as it should be. If I let the boat sit for a week or so, the primer bulb is soft and i have to pump it to get hard again before i start it. I have tested the fuel pressure in the VST and its at 40 psi, where I think it should be. I am starting to think that those check valves are bad and the pistons on the down stroke are forcing the fuel pressure back towards the tank. I am pretty mechanically inclined and feel like i can fix whatever the issue is myself, my problem has been the diagnosis of the problem. Has anyone experienced these symptoms and come up with a solution? I feel like I should just take it to the dealer before i replace everything. It might be cheaper.
Thanks in advance.
