BigBendFishing.Net

I’ve been experiencing motor issues on a small outboard I own and was hoping one of you might be able to give me some advice on how to fix it. I can take it to the mechanic but before doing so I’d like to see if this is something I can fix, that is with a little help from my forum friends. The motor is a 2000, 9.9 Merc 2 stroke. The engine starts and ideals without issues. The problem is I’m only getting about ¼ power at full throttle. So far I have checked the fuel lines from the tank to where it enters the carb and found no blockage. I’ve sprayed carb cleaner into the carb. I also sprayed it into the hole where the gas line enters the card along with compresses air in the hopes of clearing up any blockage. I’ve pulled the spark plugs, cleaned them and put them back in. They looked good so they haven’t been replaced.

Any advise would be greatly appreciated.

Sounds like maybe an air leak in your fuel line? Did you check that?

Sounds like maybe an air leak in your fuel line? Did you check that?

MIGHT WANT TO CHECK THE AIR VENT ON THE TANK CAP, IF IT IS NOT OPEN IT WILL CREATE A VACUUME IN THE TANK AND WILL NOT LET FUEL FLOW PROPERLY.
PA
SEMPER FI

HIgh speed jet on the carb might be clogged. Seafoam treatment might help.

Here's a quick fix...........Porter Marine
9355 Elgin Road
(850)421-1490

One Keeper wrote:Here's a quick fix...........Porter Marine
9355 Elgin Road
(850)421-1490

X2

I second the Sea Foam. Try it first.

Sounds just like our problem with a Johnson 9.9. Turned out to be the bulb was rotting from the inside and sending little chunks of rubber into the jet of the carb. We cleaned it out twice, ran in new fuel and it would do it again on the next trip. Finally realized it was a bad bulb and we cleaned the carb and fuel pump one last time and it has run like a top since.

Thanks guys for the suggestions. After doing about everything I could pertaining to fuel blockage without success I went back to the spark plugs. It turned out one of the plugs was only working part of the time. I replaced them and now the engine works good as new. Thanks again.

Glad you got her fixed. It is nice to know that your fuel system is clean too.

After reading some good advice from you guys I thought I would see what you guys think about the issue I'm having. I have a carbureted 25 hp Nissan. I pump the bulb til it's tight and then try to crank it and it may fire off and then it shuts right off. After that it won't crank at all unless I spray starting fluid in the carburetor and then it still only runs for a second. At first I thought maybe there was a clog in the gas line, I took the fuel line off where it goes in to the carburetor and pumped the bulb and gas comes out. Pulled the line off where it comes out of the diaphram(?) and it pumps as I hit the key. Seems to me that the line is free, is there a chance that where the fuel enters the carb is clogged? Any suggestions?

fishing coach, I bet you a dollar to a donut that Pa will advise you to first assure that your gas tank vent valve is open.

Fishin' is the mission.

I'll save him a post. Read his post earlier that said that and made sure it was open with no luck.

Check the spark plugs and plug wire connections, then the filter in the carb bowl. Sounds like a spark problem, but could be fuel.