'05 Optimax RPM's Fluctuate '05 Optimax RPM's Fluctuate
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    '05 Optimax RPM's Fluctuate
from Marty #14604 #14604  
5/6/2012 11:40:21 PM


 Your thoughts please: I have a 2005 225 Optimax with less than 400 hours on it. It seems that after 5-7 minutes of running hard (5500+ rpm) the RPM's drop about 500 RPM and then fluctuate at a steady rate +/- 200RPM. You can see the ground speed rise and fall on the GPS and you can feel the speed up-speed down sitting in the seat. I have alreay replaced the throttle position sensor, no help. Anyone with a clue to my problem? Your thoughts please. Thanks.

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   fuel from Dwight #10907 #10907  5/7/2012 8:18:40 AM
 Did you change the fuel lines and the bulb.

   motor Opti from DLW #10436 #10436  5/7/2012 12:29:57 PM
 Fuel reeds

   There could be a bulletin for coil replacement on that engine from Brad  5/7/2012 6:42:13 PM

To my knowledge, none of the engine manufacturers are required to notify their customers if there is a problem with their engines...

There needs to be a law!

Hope you find the problem

   If it's a standard Opti check the reeds from JohnM  5/7/2012 10:18:14 PM
 I've heard from several sources they need to be checked every 100 hours or so as they tend to crack. If one gets lodged in a piston it can be bad juju. The standard Opti doesn't have fiber reeds.

As for Brad and the coil issue there are laws PILES of laws. A bad coil won't leave you stranded. He will also tell you ANY problem built by union hands is top of the line. I guess this doesn't extend to the Mercury Outboard?

If it were mine I'd have a certified mechanic check it out. IF it is a coil it's darn near impossible to isolate which one it is without a computer and the TSB Brad speaks of only relates to 250 and 175 ProXS motors to my knowledge. IF you have a bad coil (it can happen on ANY engine) it can lead to a bad wiring harness. These high tech motors have known to have problems from something as simple as a loose battery connection or dying battery not sending enough juice to your throttle position sensor to a bad plug, to an entire bad wiring harness. After watching a tech rep trouble shoot a wiring harness seeing how everything is tied together it could be any number of things.

Hope you get her fixed up soon.

   Mercury from Dwight #10907 #10907  5/8/2012 8:48:45 AM
 Funny I thought Mercury built its motor in Mexico. Didn't know they had unions down there.

   I had a similar problem from JerseyBasser  5/8/2012 3:22:03 PM
 on my 225 Opti but was an 03. It didnt ever show up until the high end like you speak. I ran it for a couple weeks then the problem finally showed up. It started out as a very very small hole in the high pressure fuel line and with more running it opened up and left me with 17 lbs in the well when I was going to weigh in. Just a thought,mine didnt take long to completely bow out.

   John M from Marty #14604 #14604  5/9/2012 12:25:17 PM
 Thanks for your insight into my problem. BTW, not since March 2001 have I had the following, job security, a good wage, great benefits and good working conditions. Not since then have I had medical or dental or have I made more than $25k a year. I am a damn proud and thankful Union member. Now because of my Union I can live with a reasonable standard of living. It's not quite as good as the 90's but all things condidered, it's good to be safe from coporate greed. I am no longer a victim. Thank you ATU.

   Marty hope you get your outboard fixed from JohnM  5/10/2012 7:48:07 AM
 I was able to buy my last two Mercs because of the skills I posess. I chose Mercury because I've been trying to purchase American made or owned products where it makes sense so fellow Americans have jobs.

Brad knows exactly what I'm talking about.

All these new outboards have issues thanks to EPA Mandates.

   Marty from Brad  5/11/2012 9:41:55 PM
 I remember when the union label was a source of pride for America---what did they do to us??

I'm very greatful that you have a good union job Marty!

John, my opinion about the mandates is that they gave the industry a much needed kick in the behind--They all complied years ahead of the mandate--first with 4 strokes, then with DFI--

DFI--For the first time in 2 stroke history, unburned crankcase fuel/air mixture are not expelled with the exhause on every stroke. Port timing allows the injection at the precise moment that the exhaust port closes--a true revolution in the industry! Safer, more reliable and less polluting-

I keep immaculate records in my trip log and i am getting a full mile farther per gallon with my '06 115 opti than i did with any of the old 3 cyl 2 strokes, from 3.25nm to 4.25+.

Despite my problem with merc, i plan to get another one (American made) next time--That 3 cyl 125 will be THE most efficient engine in its class.

   '05 225 Optimax RPM's fluctuate, (one more question please) from Marty #14604 #14604  5/13/2012 7:31:31 PM
 Thanks to all who responed to my last post on this subject. I finally took the plunge and removed the decking to get to my fuel tank to check what type of fuel line I have. I had to do this because due to very poor factory or dealer rigging I had to replace a good portion of the line. The replacement line is ethanol proof. I could not get a good look at the remaining original line, that's why I went through all the trouble. Anyway, the original line is 350-0380SAE J1527 USCG Type A1 ISO 7849-A1
My question is, is that line ethanol proof? Thanks in advance for your replies.

   Sounds like MPI hose-should be OK from Freeonboard  5/15/2012 1:42:08 PM
  The high nitrile tube is what makes it alcohol resistant.






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