2003 mercury 225 2 stroke optimax LOW hours bought year end

[BigShow]

I bought a used parker with the above engine boat was repowered in 2004 with the mercury 5 year warrenty the boat sat for 2 years before i purchased. My warrenty was out Nov of 2009, Of course i have a problem this year. I started the year motor ran GREAT and strong. It sat for about 2.5 weeks thill i got down there today, I went to start it up and it idled REAL ROGH almost till stall (which it did do later). I rved it in neutral to about 2000 rpm and it was a real strain on the motor. it sounded as it was miss firing. ( it is a 6 cylander) I got the mechanic from my marina who does my winterizing dewinterizing etc) they tell me a week before they can look at it. after a long debate he comes and looks, this is where it gets over my head) hooks everything up electronically and tells me after a self diagnostic it is throwing no codes and according to computer it is running fine. he does other checks and comes to the conclussion that it is a clogged gas nozzle in cylander 2 and 3 causing the problem, they want to ship it out to get cleaned. my question is does this sound legit? It ran beautiful 2 and a half weeks ago, how can something clog so fast with no gradual loss of power? i think it is something electronic? any thoughts I kmnow most here are running yammies but i only have about 300 hours on the motor with me putting about 200 on it in the year and a half i owned it

 

[BigShow]

ALSO was told air and fuel pressure should be 90 air 80 fuel and i was 80 air -70 fuel

 

[Megabyte]

Hard to diagnose over the 'net, but with the information you have given, it sounds like a fuel issue.

Bad fuel
Clogged injectors
Clogged VST
Clogged 10 micron filter
Debris in the pickup tube

There are a number of areas I've not touched on that could be problematic, but they would all be fuel related according to what you are telling us.

 

[BigShow]

the mechanic was leaning toward clogged injectors too. but i was keptical since it ran great so recently would it clog so easy just on the next trip out? and thank you

 

[nhr3]

I have a 225 Merc EFI. I have to be very carefull putting the motor cover on or I dislodge one or more of the ignition coil input wires. Symptoms sound the same as you are having. Woth a look.

 

[BigShow]

That was about all i was able to check unbelievable how far advanced everything is, couldn't even get near a distributor cap or the current equivelnat of one. mechanic is saying clogged air and fuel injectors