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-   -   90Hp Mercury Optimax NEED HELP (https://www.thehulltruth.com/boating-forum/1030771-90hp-mercury-optimax-need-help.html)

chris90hp 08-17-2019 09:58 PM

90Hp Mercury Optimax NEED HELP
 
What's up guys,

I have a 2010 90 Hp Mercury Optimax 2 stroke outboard that is starting to give me trouble. This boat was given to me 2 years ago by my uncle, who had a mechanic maintain it over the last 8 years Recently on the past two runs we had the engine would bog down and lose a sufficient amount of power, out of nowhere the power would return but then it would be lost just as quick. We thought it was maybe it was some water in the fuel so we put in some starton in the but the problem persisted. The engine started fine, but never got enough power to come up on plane and the engine continued to stall out several times on the way in. We are guessing it is a fuel issue but we are not sure on where to start. I can't seem to find a water seperator on this boat,It's a 2010 Bayliner, Any help is appreciated, Thanks, Guys!

limitman 08-18-2019 02:23 AM

Check your fuel lines. Sometimes the inside part of fuel line collapses and robs the engine of fuel. Then check fuel pumps

brownman 08-18-2019 03:24 AM

Well if pouring in starton didn’t fix it it’s time for a new motor!!!!!

davidwademarine 08-18-2019 03:42 AM

Ignition coil.

drumbeater 08-18-2019 06:58 AM

Run it on an 3 gallon external tank and see if quits bogging (don't forget to add some oil to the gas, not sure how the optimax mixes gas/oil). Squirt some of your fuel into a mason jar and see if you have trash or water in it. That will eliminate fuel contamination and/or delivery issues, from the tank anyway.

DonV 08-18-2019 07:02 AM


Originally Posted by brownman (Post 12838947)
Well if pouring in starton didnít fix it itís time for a new motor!!!!!

NO doubt!! He should have used StaBil 360 and I'm positive he would have had success!! Or the ever famous Seafoam would have fixed that coil!!

Eightpter 08-18-2019 08:46 AM

Check the filter in vst and see if any junk in there. Also check fuel/air psi on rails and see what those are.

nevets 08-18-2019 10:12 AM

First thing invest 150$ and get a good racor filter setup and new fuel lines.Its a Boat and will get some water accumulation in the tank. and since the water is heavier than fuel the first thing headed down stream is the water. and fix the coil

Fishman39 08-18-2019 10:19 AM

Check your battery and wiring. All connections. Check battery voltage. These are power hungry engines. Make sure battery is at least 1000 cca.

brownman 08-18-2019 12:56 PM

Pics of the wife!!!!!

stevechumo 09-18-2019 01:27 PM

Try to hook up to a separate small outboard fuel tank and run it. My Optimax 225 has a mixture of 100:1, so I'd think yours maybe the same. Also, replace all fuel and oil filters to see if that improve. Seafoam is good to clean the engine, but only use it in a separate small fuel tank.

Fishman39 09-19-2019 03:50 AM


Originally Posted by stevechumo (Post 12942000)
Try to hook up to a separate small outboard fuel tank and run it. My Optimax 225 has a mixture of 100:1, so I'd think yours maybe the same. Also, replace all fuel and oil filters to see if that improve. Seafoam is good to clean the engine, but only use it in a separate small fuel tank.

Dont premix an opti. Bad things happen.

stevechumo 09-19-2019 02:20 PM


Originally Posted by Fishman39 (Post 12943368)
Dont premix an opti. Bad things happen.

That's good to know.

Ifishalot 09-19-2019 02:34 PM


Originally Posted by Eightpter (Post 12839710)
Check the filter in vst and see if any junk in there. Also check fuel/air psi on rails and see what those are.

Tons of good info in this thread. But, first things first. See bold print above.


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