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Started By
Message
OB boat mechanics
Posted on 4/26/14 at 1:59 pm
Posted on 4/26/14 at 1:59 pm
Yamaha 250 saltwater series 2 ox66. Runs fine but won't get past 4800 rpm. Usually tops out at 56-5700. Ran sea foam through it and no change Ran it for the whole weekend burning about 25 gals. Should have been enough to clean it out if it was some gunk in the fuel system I would think. Any ideas?
This post was edited on 4/26/14 at 2:03 pm
4
Posted on 4/26/14 at 1:59 pm to MallardMaster
?
Posted on 4/26/14 at 2:12 pm to MallardMaster
do the basics first
fuel filter,wster seperator,
sparkplugs.
check the compression on all of the cylinders make sure one of them isnt weak.
the 0x66 is a great outboard
unless your name is alx
fuel filter,wster seperator,
sparkplugs.
check the compression on all of the cylinders make sure one of them isnt weak.
the 0x66 is a great outboard
unless your name is alx
Posted on 4/26/14 at 2:18 pm to greasemonkey
It's been great. Starts on the first crank every time. It ran perfect the last time we ran it last year. Gave us this problem the first time we ran it this year.
Posted on 4/26/14 at 2:28 pm to MallardMaster
First thing I would check is your prop, make sure it not bent and the ports on the prop are open if you have some.
Posted on 4/26/14 at 2:36 pm to hogdaddy
Prop is fine. Motor idles and runs fine at the lower rpm so it doesn't seem to be the plugs or a problem with ignition in a cylinder. Has all it's power jumping out the hole and it didn't decrease max rpm over time so I doubt it to be low compression on a cylinder. It seems to me like a fuel issue but I don't know where to start on this motor. If it was carbureted I would have pulled them and cleaned them. Not sure how the fuel ingection system works.
Also we just changed the fuel water separator before the first trip.
Also we just changed the fuel water separator before the first trip.
This post was edited on 4/26/14 at 2:39 pm
Posted on 4/26/14 at 3:34 pm to MallardMaster
quote:
Also we just changed the fuel water separator before the first trip.
I'd look back over your work. If it worked fine last year and then you worked on it before you used it this year; you may have messed something up or installed a bad part
Edit to say- I'm not a mechanic by in means, but have been known to screw my shite up at times.
This post was edited on 4/26/14 at 3:36 pm
Posted on 4/26/14 at 4:51 pm to tigers win2
Did you remove the prop? check the shaft? - it is either restricted or loading up.
Is the temp running hot? or the same as normal
old gas? what kind of gas are you using?
Is the temp running hot? or the same as normal
old gas? what kind of gas are you using?
Posted on 4/26/14 at 4:59 pm to MallardMaster
Check all of your fuel lines. I had similar issue with mine the lines were corroding from inside. Couldn't get max fuel flow, changed fuel lines then ran like a champ
Posted on 4/26/14 at 5:30 pm to gplayerjr
It had half a tank from last fall. Topped off with premium. Could be fuel lines or an issue with the new fuel water seperator or installation of it. I'll start there
Posted on 4/26/14 at 5:50 pm to MallardMaster
Get a six gallon tank with high octane good gas maybe put some seafoam in it too and try it out if it runs fine and you are hitting rpms you know it is in your fuel lines, if it does the same shite u know it is not.
If it does the same shite, maybe something electrical like stattor, fuel pump switch powerpack etc.
I had one do this a few years back and it was just bad gas, once I burned tank off it was fine.
If it does the same shite, maybe something electrical like stattor, fuel pump switch powerpack etc.
I had one do this a few years back and it was just bad gas, once I burned tank off it was fine.
Posted on 4/26/14 at 6:29 pm to MallardMaster
Your high speed jets could be gummed up
Posted on 4/26/14 at 7:45 pm to gplayerjr
quote:
Check all of your fuel lines. I had similar issue with mine the lines were corroding from inside. Couldn't get max fuel flow, changed fuel lines then ran like a champ
This is your problem or the tank vent line is plugged. Next time running it, open the fuel tank fill cap to see if you are not getting a vacuum in your tank.
This post was edited on 4/26/14 at 7:47 pm
Posted on 4/27/14 at 5:41 am to fishfighter
quote:
Check all of your fuel lines. I had similar issue with mine the lines were corroding from inside. Couldn't get max fuel flow, changed fuel lines then ran like a champ
Same here, had same problem on one engine. After changing fuel filters and plugs still had problem, changed gas same problem. changed out fuel lines on both as a shot in the dark and problem solved.
Posted on 4/27/14 at 8:00 am to cave canem
quote:
Your high speed jets could be gummed up
This right here.
Posted on 4/27/14 at 9:07 am to MotorBoater
its fuel injected it doesn't have high speed jets
Posted on 4/27/14 at 9:14 am to MallardMaster
quote:
an issue with the new fuel water seperator or installation of it.
If it wasn't broke why did you do this?
Posted on 4/27/14 at 2:41 pm to Nascar Fan
quote:.
If it wasn't broke why did you do this?
The old one rusted through. It had to be replaced.
Posted on 4/27/14 at 2:50 pm to MallardMaster
So y'all just dump the contents of the filter and reuse? I thought that made sense, but "knowledgable" buddies said replace it.
Posted on 4/27/14 at 5:07 pm to QuietTiger
unless it is rusty , just dumping it is fine
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