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Jan 23rd, 2013
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150HP Mercury Optimax Pro XS 2-stroke #13702632 09/16/20 09:19 PM
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FishinAg02 Offline OP
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I am a little put out!

I bought a new to me boat this summer from a lawyer who obviously didn't know much about boats, it's a 2011 Nitro X7 Sport. The boat is in phenomenal shape, clean all over. Previous owner had it serviced right before i bought it and provided all the paperwork.

Have run approximately 4-5 tanks through it already, and it runs great with the exception that it dies easily at low idle. Neighbor has the same motor and told me he had a similar problem, check spark plugs, wires, etc. I did and found no issues. Found a small oil leak upon returning from the lake a couple of weeks ago and took it to the shop and asked the mechanic to take a look at the motor to determine the idle issue as well as address the oil leak.

He called me back today and here is what he has found... Cylinder compression ranges from 100-110 on all cylinders except for one which is 90. So none are good, which seems hard to believe. Should be 120. Motor has only 53 hrs on it (i'm totally shocked!!!!). I've put 20 to 30 hrs on it this summer! That means the previous owner only put 20-30hrs on the boat over 9yrs. Mechanic believes i need a re-built powerhead, cylinders rusted from sitting too long without being run, rings are sticking, etc. His recommendation? Find a used motor and swap out and sell this one. He said if he puts motor into break-in mode and double oils, it runs fine and doesn't die at all (other than smoke a lot), which confirms his rusty cylinder conclusion.

Holy [censored]... not at all what i expected.

Any thoughts or suggestions? I am lost for words?

David


David Norwood
Fightin' Texas Aggie Class of '02
Cell - 346-347-0177
Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13702642 09/16/20 09:28 PM
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Find a new mechanic. In the mean time soak each cylinder top with some power tune then run a can or two through it. The do a new compression test with the engine warm and the throttle fully open. If compression is better I'd look at having the injectors cleaned. Sitting for several years the fuel in them more then likely turned to varnish in them and they are not flowing properly.

Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13702668 09/16/20 10:15 PM
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I had a friend with a 90 similar issue. I put automatic transmission fluid in the cylinder, I put about 1 tablespoon. Let it soak for 2 days. I then used a suction tool to remove most of the fluid. Then pulled all plugs. Spark plug boots wrapped in plastic and turned the motor over to push the rest out of the cylinder. The at restored compression by freeing the rings.

You can buy a bore scope off amazon for bout 30 bucks and take a look in the cylinders yourself. I would try this first before replacing a power head.

Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13702756 09/17/20 12:26 AM
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FishinAg02 Offline OP
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Anybody have a mechanic they would recommend in the west Houston area?


David Norwood
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Cell - 346-347-0177
Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13703241 09/17/20 02:53 PM
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boatman025 Offline
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May try Sport Marine, are Acie Outboard


Hughes Marine
3855 Osage Lane
Wylie ,Texas
Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13703454 09/17/20 06:54 PM
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FishinAg02 Offline OP
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Okay, an update with additional information.

Mechanic said the engine has over 3000 second of operation in low oil alarm, plus, what i thought was a lower unit seal leak, was actually an oil leak on the direct injection system. Most likely the cylinder with the lowest compression (90 psi) has been starved oil (we are assuming the leak is on that line). The mechanic said it has been leaking oil for "years", it was dried and caked all the way down the lower cowling.

It appears the original owner would run the motor until he heard the low oil alarm and then he would top off the emergency tank on the side of the motor, never once filling the main oil reservoir in the boat.

I feel sick about it all and taken advantage of by the original owner who talked all about the servicing he had done on the motor, etc. Which now seems like total BS.


David Norwood
Fightin' Texas Aggie Class of '02
Cell - 346-347-0177
Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13703697 09/18/20 12:51 AM
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Dang. That sucks. Time to buy a motor.

Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13703971 09/18/20 12:29 PM
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This is why you always have a mechanic check it out before you buy

Re: 150HP Mercury Optimax Pro XS 2-stroke [Re: FishinAg02] #13704195 09/18/20 03:47 PM
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FishinAg02 Offline OP
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yep, i agree. i was a poor decision not to have it checked out. In december, I bought a used vehicle and took it to a mechanic for a thorough inspection... why wouldn't I do that with a boat? Again, poor decision.

David


David Norwood
Fightin' Texas Aggie Class of '02
Cell - 346-347-0177
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