Blue Needs Help!

[willy]

Blue Man did you happen to notice the fuel primer bulb when this was happening, some of what you are saying are problems I had with diffrent motors over the years and they traced back to one, fuel bulb, even a new one cause they are all crap now, two, fuel pump on the side of the engine.
If not those and the plug pull does not reveal any issues in one or more cylinders time to run an auxilliary tank.
Also a good run like you had last week in some rough water can combine with the ethanol crap in your gas to dislodge a lot of sheeeet in your tank and lines, check your in line filter and the fuel/water seperator, you are likely to find unidentifiable sheeet in one or both of them.

[willy]

Oh yea one more thing, when was the last time you gave that puppy a decarbing of the cylinders?
Carbed up cylinders cause all kinds of sheeet, over heating, timing issues believe it or not, due to uneven compression and detonation along with reduced flow of the exhaust and intake, the cylinders never carb up evenly.
Thats all I got for now Dawg

[Blue_Runner]

Changed plugs, check. Cleaned all filters, check. Ran on auxillary tank, check...none of which fixed the problem. Time to

This is a bunch of I am supposed to be fishing for the next 2 weekends!!

[Blue_Runner]

When I get home I'm going to pull the new plugs and check it out good to see if I can tell if there is a cylinder not firing. If I can't tell I'm going to put the old-new plugs back in and do a decarb session, then put the new-new plugs back in. If that does not fix it I'm going to use my 9.9hp the rest of the year!! Not really, but that is what I feel like doing.

Will update when I know more. Thanks to everyone!

[Mulv80]

Next step for me would be a carb rebuild. Its not that difficult as long as you have the FACTORY repair manual. I'm betting you have some debris floating around in your carb bowls. I'm not sure about Yamaha but you may have a screw at the bottom of each bowl that you can loosen and let them drain and shoot some carb cleaner through. Its not the right way to do it but it may work.

[Blue_Runner]

Thanks Mulv for the advice...but there are 2 things that I don't know jack doo doo about....they are carbs and fiberglass.

Not a good father's day for Blue. Does anybody want to fly in to NC to help me fix this?

[Mulv80]

Blue, the carbs arent like what your thinking. There are no adjustments for air or idle screws or any of that good stuff. If they are like my 2000 Johnson 150 all the jets are fixed no adjustment required. You take each carb off, unscrew the bowl, shoot some carb cleaner through the jets, blow some compressed air through them, replace the gaskets, new needle, seat, and float, re-install. Sounds complicated, but its not.

The only thing that can be tricky is the Lync and Sync but alot of motors you don't have to disturb the linkages to remove the carbs. Trust me I have rebuilt carbs on 4 different motors and I'm no master mechanic, its that easy.